Step 1 :

The function is .

Find  .

Consider .

Differentiate on each side with respect to .

Substitute and in .

Step 2 :

Trigonometric identity :.

Trigonometric formula :.

.

.

.

If then , and .

Substitute , and .

.

Solution :

.

Step 1 :

Find .

.

Trigonometric identity :.

Step 2 :

Trigonometric formula :.

Step 3:

If then , and .

Find .

.

Find .

.

Step 4:

Substitute , and .

Solution :

.

.