What is the equal of this statement?

Question

coseca-sina

--------------- -1

coseca

A) cos^2a

B) sin^2a

C)1-cos^2a

D)-sin^2a

E)sin^2a-1

Answer 1

Replace cosecant with 1/sin to get:

Get a common denominator to turn sin(a) into sin²(a)/sin(a) then combine to get:

Invert the denominator and multiply to get:

1 - sin²(a) - 1 and then simplify to get -sin²(a)