chapter. 7 transcendental functions · in this chapter we introduce several ... writing the first...
TRANSCRIPT
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Mathematics
Lecture. 3
Chapter. 7
TRANSCENDENTAL FUNCTIONS
By
Dr. Mohammed Ramidh
Dr. Mohammed Ramidh
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TRANSCENDENTAL FUNCTIONS
OVERVIEW: Functions that are not algebraic are called transcendental. The trigonometric, exponential, logarithmic, and hyperbolic functions are transcendental, as are their inverses. In this chapter we introduce several important transcendental functions and investigate their graphs, properties, derivatives, and integrals. .
Dr. Mohammed Ramidh
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Dr. Mohammed Ramidh
7.1 Inverse Functions and Their Derivatives A function that undoes, or inverts, the effect of a function ƒ is called the inverse of ƒ, Inverse functions play a key role in the development and properties of the logarithmic and exponential functions.
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˝Finding Inverses To read the value of a function from its graph, we start at a point x on the x-axis, go vertically to the graph,and then move horizontally to the y-axis to read the value of y. The inverse function can be read from the graph by reversing this process. Start with a point y on the y-axis, go horizontally to the graph,and then move vertically to the x-axis to read the value of x = 𝑓−1(y) see (Figure 7.2)
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EXAMPLE 1: Finding an Inverse Function
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EXAMPLE 2:
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˝Derivatives of Inverses of Differentiable Functions
from Example 1, we see that
THEOREM 1 The Derivative Rule for Inverses
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2
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EXAMPLE 4: Finding a Value of the Inverse Derivative
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EXERCISES 7.1: 1. Each of Exercises, gives a formula for a function y = ƒ(x) and shows the graphs of
ƒ and Find a formula for in each case.
2. Formulas for Inverse Functions.
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3.
4.
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7.2 Natural Logarithms
In this section we use integral calculus to define the natural logarithm function, for which the number a is a particularly important value.The natural logarithm of a positive number x, written as ln x, is the value of an integral.
DEFINITION, The Natural Logarithm Function
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The Derivative of y = ln x
For every positive value of x, we have
Notice: If u is a differentiable function of x whose values are positive, so that ln u is defined, then applying the Chain Rule .
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EXAMPLE 1: Derivatives of Natural Logarithms
Notice: The functio n y = ln 2x has the same derivative as the function y = ln x. This is true of y = ln ax for any positive number a:
Since they have the same derivative, the functions y = ln ax and x differ by a constant.
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Properties of Logarithms
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EXAMPLE 2: Interpreting the Properties of Logarithms
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EXAMPLE 3: Applying the Properties to Function Formulas
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The Integral f ( 𝟏
𝒖 ) du :
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The Integrals of tan x and cot x Equation (5) tells us at last how to integrate the tangent and
cotangent functions.
……….(5)̕
EXAMPLE 5: Applying Equation (5)̕
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EXERCISES 7.2 1. Using the Properties of Logarithms
a. Express the following logarithms in terms of ln 2 and ln 3.
b. Use the properties of logarithms to simplify the expressions in
Exercises 3 and 4.
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2. In Exercises 8–22, find the derivative of y with respect to x, t,or ѳ as
appropriate.
3. Evaluate the integrals in Exercises 37–54.
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7.3 The Exponential Function We study its properties and compute its derivative and integral.
Knowing its derivative, we prove the power rule to differentiate when n is any real number, rational or irrational.
The Function
We can raise the number e to a rational power r in the usual way:
……….(1)
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Graphs of exponential functions
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The Chain Rule extends Equation (5 ) in the usual way to a more general form.
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EXERCISES 7.3 1. Solving Equations with Logarithmic or Exponential Terms
In Exercises 6–10, solve for y in terms of t or x, as appropriate.
In Exercises 13–16, solve for t.
2. In Exercises 23–32, find the derivative of y with respect to x,t,or ѳ as appropriate.
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In Exercises 37–40, find dy⁄dx.
3. Evaluate the integrals in Exercises 43–62.
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7.4
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Writing the first integral in differential form gives
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The arithmetic rules satisfied by, given in Table 7.2
For example,
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EXERCISES 7.4 1.
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2. In Exercises 11–32, find the derivative of y with respect to the given
independent variable.
3. Evaluate the integrals in Exercises 47–74.
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7.5 Inverse Trigonometric Functions
• Inverse trigonometric functions arise when we want to calculate angles from side measurements in triangles. This section shows how these functions are defined,graphed, and evaluated, how their derivatives are computed.
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The graphs of the six inverse trigonometric functions are shown in Figure
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Derivatives of the Other Three
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EXAMPLE 10:
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Dr. Mohammed Ramidh
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Dr. Mohammed Ramidh
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EXERCISES 7.7
1. Use reference triangles like those in Examples 1–3 to find the angles in Exercises 1–12.
2. Trigonometric Function Values
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3. Find the values in Exercises 17–20.
4. Finding Trigonometric Expressions, Evaluate the expressions in Exercises 29–37.
5. In Exercises 49–69, find the derivative of y with respect to the appropriate variable.
6. Evaluate the integrals in Exercises 71–94.
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7.6 Hyperbolic Functions ƒs -xd = -ƒsxd. ƒs -xd = -ƒsxd. ƒs -xd = -ƒsxd. ƒ ƒs -xd = -ƒsxd. s -xd = -ƒsxd.
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In this section,we give introduction to hyperbolic functions, their graphs, how their derivatives are calculated.
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Definitions and Identities
The six basic hyperbolic functions.
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Dr. Mohammed Ramidh
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Identities for hyperbolic functions
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Derivatives and Integrals
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Dr. Mohammed Ramidh
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Inverse Hyperbolic Functions
The inverses of the six basic hyperbolic functions are very useful in integration, We denote its inverse by
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Dr. Mohammed Ramidh
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Useful Identities for inverse hyperbolic functions
Derivatives of inverse hyperbolic functions
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EXAMPLE 2: Derivative of the Inverse Hyperbolic Cosine Show that if u is a differentiable function of x whose values are greater than 1,then
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Integrals leading to inverse hyperbolic functions
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EXAMPLE 3: Evaluate
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EXERCISES 7.8 1.
2. Use the identities
c.
3. In Exercises 13–28, find the derivative of y with respect to the appropriate variable .
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4. Evaluate the integrals in Exercises( 41–60).
5. Evaluate the integrals in Exercises( 67–72) in terms of
inverse hyperbolic functions.
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