Identities Flashcards
1
Q
Sin(A+B)
A
Sin (A+B)=SinACosB+SinBCosA
2
Q
Tan(2x)
A
(2tanx) /(1-tan^2x)
3
Q
Sin²+Cos²=
A
Sin²+Cos²=1
4
Q
1+tan²=
A
1+tan²=sec²
5
Q
Tan(x/2)
A
±√(1-cosx)/(1+cosx)
6
Q
Sin(x/2)
A
Sin(x/2)=±√(1-cosx)/2
7
Q
1+Cot²=
A
1+Cot²=Csc²
8
Q
Cos(x/2)
A
±√(1+cosx)/2
9
Q
Other tan(x/2)
A
Sin x/ 1+cos or 1-cos x/sinx
10
Q
Cos(-x)=
A
Cos(-x)=cos(x)
11
Q
sec(-x)=
A
sec(-x)=sec(x)
12
Q
Sin(A-B)
A
=SinACosB-SinBCosA
13
Q
Cos(A+B)
A
CosACosB-SinASinB
14
Q
Cos(A-B)
A
Cos(A-B)=CosACosB+SinASinB
15
Q
Tan(A+B)
A
Tan(A+B)=(TanA+TanB)/1-tanAtanB
