If , verify that

(i)

(ii)

(iii)

Find the value of x in each of the following:

If , verify that:

(i)

(ii)

(iii)

(iv)

If A = 30° and B = 60°, verify that

(i) .

(ii)

If sin (A - B) = sin A cos B – cos A sin B and cos (A - B) = cos A cos B + sin A sin B, find the values of sin 15° and cos 15°.