(a) 

The trigonometric function is .

Reciprocal identity : .

.

(b) 

Pythagorean identity: .

Reciprocal identity: 

. 

(c) 

Co - function identity : .

. 

(d) 

Apply Pythagorean identity: .

.

(a) ,

(b) ,

(c) , and

(d) .