State for any acute angle θ whether :

cos θ increases or decreases as θ increases.

State for any acute angle θ whether :

tan θ increases or decreases as θ decreases.

If A = 30° ; 3 sin A - 4 sin³ A is equal to:

1. cos 3A

2. tan 3A

3. sin 3A

4. cot 3A