Verify the identity. tan 0 cot 0 = cos 0 sec 0 To verify the identity, start with the more complicated side and transform it to look like the other side. Choose the correct transformations and transform the expression at each step tan 0 cot 0 tan e sec 0 sec 0 Apply a reciprocal identity. Factor out the greatest common factor, tan 0. Apply a Pythagorean identity. Separate the quotient into two terms