If cot A = tan A and 0 ≤ A ≤ 90°, the measure of angle A is :

1. 30°

2. 60°

3. 45°

4. 90°

The value of :

cos² 60° - 2 sin³ 30° + 3 cot⁴ 45° is :

1. 1

2. -2

3. 3

4. 2

Find the value of:

sin 30° cos 30°

Find the value of:

tan 30° tan 60°