Verify the identity.

tan() + cot() = sec() csc()

Use a Reciprocal Identity to rewrite the expression in terms of sine and cosine as a single rational expression.

tan() + cot()	=	sin() cos() + sin()
	=	cos() sin()

Use a Pythagorean Identity to rewrite the expression in terms of a single function, and then simplify.

	=	cos() sin()
	=