(a)

The trigonometric function is .

Reciprocal identity : .

.

(b)

Pythagorean identity :  .

.

(c)

Reciprocal identity: .

Pythagorean identity: .

.

Reciprocal identity:

.

(d)

Co - function identity : .

.

(a) ,

(b) ,

(c) , and

(d) .