1. Verifying means to solve a problem. To verify something, you must check to so see if it is correct. It meant to solve and go to several steps in order to achieve the correct answer. Verifying means checking different identities and solving them to see if you end up with the correct answer in both sides.
2. Tips would be to turn everything into sin/cos to make everything easier. Finding the common denominator also. Multiplying the conjugate would also make it easier, and that is the denominator binomial. Factoring and separating fractions are also tips to make the problem easier.
3. I look at the problem to see if I can turn anything into sin/cos. sometimes when a problem looks hard, it may already be an identity that equals 1, so that makes it a lot simpler. Memorizing the identities really helps with this because this way you know what it equals. You keep substituting what you know in order to get your final answer. The answer will either have to be as simple as it can be, or equal to the problem you are verifying.
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