Trigonometric Identities Flashcards
1
Q
Cos^2x +sin^2x=
A
1
2
Q
Sec^2x=
A
1+tan^2x
3
Q
Cosec^2x=
A
1+ cot^2x
4
Q
Sin2A=
A
2sinAcosA
5
Q
Cos2A=
A
Cos^2A-sin^2A
Or
2cos^2A-1
Or
1- 2sin^2A
6
Q
Tan2A=
A
2tanA/1-tan^2A
7
Q
R formula
Cos( @+a)=
A
Cos@cosa-sin@sina
8
Q
R formula
Cos(@-a)=
A
Cos@cosa+sin@sina
9
Q
R formula
Sin(@+a)=
A
Sin@cosa+cos@sina
10
Q
R formula
Sin(@-a)=
A
Sin@cosa-cos@sina
