Trigonometric Formulae Flashcards
1
Q
The identity involving tan2x:
A
- Tan2x = sec2x -1
2
Q
What are the 3 formulae for cos2x (double angle)
A
- Cos2x - sin2x
- 1 - 2sin2x
- 2cos^2x - 1
3
Q
Double angle formula for sin2x
A
- 2sinxcosx
4
Q
Double angle formula for tan2x
A
2tanx / (1 - tan2x)
5
Q
The identity involving cot^2x and cosec^2x
A
- Cosec2x = 1 + cot2x
6
Q
What is cosec(x)
A
1/sin(x)
7
Q
What is sec(x)
A
1/cos(x)
8
Q
What is cot(x)
A
1/tan(x)