Verifying Trig Identities

Verifying, or proving, trig functions is only a matter Of plugging and chugging. There are some suggestions that you should follow though when verifying a trig function. 

1. Simplify the more complicated side: the equation will look something like sinx=sinxcosx. So the right side would be better to simplify because it is more complicated.

2. Find the common denominators: this is a relative rule that applies to almost all maths and should be common sense by now.

3. Change all trig functions in terms of sin and cos: sin and cos are far easier to work with than tan which is sin/cos anyways.

4. Use an identity: an identity is exactly that- an identity! It's very similar ton the transition property used in geometry where if A = B and  B= C, then A = C.