Rewrite in terms of sines and cosines.

Cancel the common factors.

Apply pythagorean identity.

Simplify csc(theta)sin(theta)-sin(theta)^2

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# Simplify csc(theta)sin(theta)-sin(theta)^2

Rewrite in terms of sines and cosines.

Cancel the common factors.

Apply pythagorean identity.

Simplify csc(theta)sin(theta)-sin(theta)^2