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

If A = 30°, then cos⁴ A - sin⁴ A is equal to :

1. sin 60°

2. tan 60°

3. cot 60°

4. cos 60°