#### atar90plus

##### 01000101=YES! YES! YES!

- Joined
- Jan 16, 2012

- Messages
- 628

- Gender
- Male

- HSC
- 2013

Could you guys please help me with these questions relating to trigonometry more specifically identities. Please show full work and solutions.

Simplify

Q2. c) sec x cot x

i) 5cot^2 x + 5

l) cot x -cotx cos^2 x

Prove that

Q3. a) cos^2 x-1 = -sin^2x

c) 3+3tan^2 x = 3 / 1-sin^2 x

d) sec^2 x -tan^2 x = cosec^2x -cot^2x

g) cos^2 (90-x)cotx = sinx cosx