Verify each trigonometric identity by simplifying the trigonometric expression on one side of the identity to match the other side of the identity.
sin(90°- 0)•csc(-0)=-cot 0
Using A, we have
sin (90 - A) * csc (-A) Note that sin (90 - A) = cos A
cos A * csc ( -A) =
cos A * 1 / sin (-A) Note that sin (-A) = -sin A
cos A / - sin A =
-cos A / sin A =
-cot A
