cot theta - tan theta, tan theta to cot theta, cot theta - tan theta 2, tan 2 theta + cot 2 theta, tan theta + cot theta 5, tan theta-cot theta/sin theta cos theta
tan theta/1-cot theta cot theta/1-tan theta. There are any references about tan theta/1-cot theta cot theta/1-tan theta in here. you can look below.