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Trigonometry Double and Half Angle Formulas
Trigonometry Double and Half Angle Formulas
6
Mathematics
9th Grade
11/19/2019
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Term
cos(2a) =
 Definition

= cos2(a)-sin2(a)

= 1-2sin2(a)

= 2cos2(a)-1
Term
tan(2a)
 Definition

2*tan(a)

1-tan2(a)
Term
cos(x÷2) =
 Definition

±√1+cos(x)

√2
Term
sin(x÷2)
 Definition

±√1-cos(x)

√2
Term
tan(x÷2)=
 Definition
[image]
Term

sin(2θ) =

 Definition

= 2sinθ cosθ
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