Here are the general steps in proving trigonometric identities:
- Start with one side. If you get stuck, then continue on other side.
- Rewrite all secants, cosecants, tangents, and cotangents in terms of sines and cosines.
- Use other known trig identities to simplify more complicated expressions.
Avoid taking square roots or raising to powers. Do not cross multiply.
- Find a common denominator.
- Simplify whenever you can by combining like terms and factoring.
As you work, you should note any restrictions on the variable.