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!
FORMULAE LIST
!
The roots of ax2 + bx + c = 0 are x ="b ± b2 " 4ac
2a , a # 0
!
Sine rule: asinA
=b
sinB=
csinC
!
Cosine rule: a2 = b2 + c2 " 2bccos A or cosA = b2 + c2 " a2
2bc
!
Area of a triangle: Area = 12 absinC
!
Volume of a sphere: Volume = 43 $ r3
!
Volume of a cone: Volume = 13 $ r2h
!
Volume of a pyramid: Volume = 13 Ah
!
Volume of a cylinder: Volume = $ r2h
!
Standard deviation: s =% x " x ( )2
n"1=
% x2 " % x( )2 nn "1
, where n is the sample size.
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