#### coyazayo

##### Member

- Joined
- Oct 20, 2014

- Messages
- 58

- Gender
- Male

- HSC
- 2018

Q1. Write down an equivalent expression consisting of one term for each of the following

A. (1-tan^2(θ/2))/(1+tan^2(θ/2))

B. (1-cos4θ)/(1+cos4θ)

Q2. Prove that (without using half-angle formula) cos22.5= \frac{\sqrt{2+\sqrt{2}}}{2}

So irritating to write some of these questions down