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It helps to convert everything to sines and cosines. Then you can often do lots of simplifications.Reminder:

sec A = 1 / cos A

tan A = sin A / cos A

cosec A = 1 / sin A

If you are unsure whether the two actually ARE equal, try evaluating both expressions (left and right) for some arbitrary value (for example, 10 degrees). If the two are NOT equal, then the expression are of course NOT equal. But if they ARE equal, you still need to prove that - since the claim is basically that the expressions are equal for ALL values of the variable.

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Q: How do I prove that sec A tan A sin A csc2 A?
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