trignometary
DESCRIPTION
TRANSCRIPT
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INTRODUCTION
Trigonometry is branch of mathematics. Which is derived from Greek Word
Tri threeGon sidesMetron measure
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BASE (B)
HYPOTENUESE (H)
PERPEND I CULAR
(P)
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T - RATIO`s
Sin θ = P/H = 1/Cosecθ
Cos θ = B/H = 1/Sec θ
Tan θ = P/B = Sin θ /Cos θ
Cosec θ = H/P = 1/Sin θ
Sec θ =H/B = 1/Cos θ
Cot θ = B/P = 1/Tan θ = Cos θ/Sin θ
θ
P
B
H
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Funny Way To Learn T- Ratio`s
P B P Pandit Badri Prasad
H H B Har Har Bole
S C T Sona Chandi Tole
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TRIGONOMETRIC - IDENTITIES•
2 2 1Sin Cos 2 21 tan sec 2 21 cot cosec
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0° 30° 45° 60° 90°
Sin
Cos 1 0
Tan =
Cot =
Sec =
Cosec =
00
4
1 1
4 2 2 1
4 2 3 3
4 2
41
4
3
2
1
21
2
Sin
Cos
0
1
112
3 32
1
2 11
2
3
2 312
1
0
1
tan 3 1 1
3
0
1
cos
11
1 2
1
0
1
sin
1
0
22
1 2
1
2
31
11
√2√32
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ANGLE OF ELEVATION – α , β (OBSERVER LOOK UPWARD)
βα
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ANGLE OF DEPRESSION – α , β (OBSERVER LOOKING DOWNWARD)
β
α
α β
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Measurement of Radian
Angle subtended at the centre by an arc of length 1 unit in a unit circle is said to have a measure of 1 radian.
1 Radian
1
1
O A
B
1
θ(r)
l
θ = l/r
l = r θ
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Notational Convection
Radian measure π x Degree measure
Degree Measure
π x Radian measure
180 180
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X
Y`
YFIRST QUADRANTSECOND QUADRANT
THIRD QUADRANT FOURTH QUADRANT
(ALL POSITIVE )(Sinθ ,Cosecθ Positive)
(90 - θ)(90 + θ)
(180 - θ)
(180 + θ)
(270 - θ)
(270 + θ)
(360 - θ)
X`
Sin (90 + θ) = Cosθ
Cos (90 + θ) = - Sinθ
(180 – θ) = Sinθ
Tan(90 + θ) = - Cotθ(180 – θ) = - Tanθ
(180 – θ) = - Cosθ
Sin(90 – θ) = CosθCos(90 – θ) = SinθTan(90 – θ) = CotθCot(90 – θ) = TanθSec(90 – θ) = CosecθCosec(90 – θ) = Secθ
Sin(180 + θ) = - Sinθ(270 – θ) = - Cosθ
Cos(180 + θ) = - Cosθ(270 – θ) = - Sinθ
Tan(180 + θ) = Tanθ(270 – θ) = Cotθ
Sin(270 + θ) = - Cosθ (360 - θ) = - Sinθ
Cos(270 + θ) = Sinθ(360 – θ) = Cosθ
Tan(270 + θ) = - Cotθ
(360 – θ) = - Tanθ
ADD
(Tanθ ,Cotθ Positive) (Cosθ ,Secθ Positive)
SUGAR
TO COFFEE
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θ 0 Π
6
π
4
π 3
π2
4π
6
3π
4
5π
6
π 7π
6
5π
4
4π
3
3π
2
5π
3
7π
4
11π
6
2π
0 1
2
1
√2
√3
21 √3
2
1
√2
1
2
0 -1
2
-1
√2
-√3
2
-1 -√3
2
-1
√2
-1
2
0
0 π6
π 4
π 3
π2
4π6
3π4 5π6 π 7π6
5π4
4π3 3π2
5π3
7π4
11π 6
2ππ6π 4π 3
π2
4π6
3π4
5π6
π
1/2
1/√2√3/2
1
-1/2
-1/√2
-√3/2-1
Sinθ
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θ 0 Π
6
π 4
π 3
Π
2
4π6
3π4
5π6
π 7π6
5π4
4π3
3π2
5π3
7π4
11π 6
2π
1 √3
2.
1
√2
1
2
0 -1
2
-1
√2
-√3
2
-1 -√3
2
-1
√2
-1
2
0 1
2
1
√2
√3
2
1
0 π6
π 4
π 3
π2
4π6
3π4 5π6 π 7π6
5π4
4π3 3π2
5π3
7π4
11π 6
2ππ6π 4π 3
π2
4π6
3π4
5π6
π
1/2
1/√2√3/2
1
-1/2
-1/√2
-√3/2-1
Cosθ
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θ 0 Π
6
π 4
π 3
Π
2
4π6
3π4
5π6
π 7π6
5π4
4π3
3π2
5π3
7π4
11π 6
2π
0 1
√3
1 √3 ∞ -√3 -1 -1
√3
0 √3 1 √3 ∞ -√3 -1 -1
√3
0
0 π6
π 4
π 3
π2
4π6
3π4 5π6 π 7π6
5π4
4π3 3π2
5π3
7π4
11π 6
2ππ6π 4π 3
π2
4π6
3π4
5π6
π
1/2
1/√2√3/2
1
-1/2
-1/√2
-√3/2-1
Tanθ
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θ 0 Π
6
π 4
π 3
Π
2
4π6
3π4
5π6
π 7π6
5π4
4π3
3π2
5π3
7π4
11π 6
2π
∞ √3 1 1
√3
0 -1
√3
-1 -√3 ∞ 1
√3
1 1
√3
0 -1
√3
-1 -√3 ∞
0 π6
π 4
π 3
π2
4π6
3π4 5π6 π 7π6
5π4
4π3 3π2
5π3
7π4
11π 6
2ππ6π 4π 3
π2
4π6
3π4
5π6
π
1/2
1/√2√3/2
1
-1/2
-1/√2
-√3/2-1
Cotθ
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θ 0 Π
6
π 4
π 3
Π
2
4π6
3π4
5π6
π 7π6
5π4
4π3
3π2
5π3
7π4
11π 6
2π
1 2
√3
√2 2 ∞ -2 -√2 -2
√3
-1 -2
√3
-√2 -2 ∞ 2 √2 2
√3
1
0 π6
π 4
π 3
π2
4π6
3π4 5π6 π 7π6
5π4
4π3 3π2
5π3
7π4
11π 6
2ππ6π 4π 3
π2
4π6
3π4
5π6
π
1
-1
Secθ
2
2/√3
√2
-2/√3
-√2
-2
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θ 0 π6
π 4
π 3
π2
4π
6
3π4
5π6
π 7π6
5π
4
4π3
3π2
5π3
7π4
11π 6
2π
∞ 2 √2 2
√3
1 2
√3
√2 2 ∞ -2 -√2 -2
√3
-1 -2
√3
-√2 -2 ∞
0 π6
π 4
π 3
π2
4π6
3π4 5π6 π 7π6
5π4
4π3 3π2
5π3
7π4
11π 6
2ππ6π 4π 3
π2
4π6
3π4
5π6
π
1
2/√3√2
2
-1
-√2
-2/√3
-2
Cose
cθ