Sun February 15, 2009 By:

20. Prove the identity:

Expert Reply
Mon February 16, 2009

The R.H.S. if simplified becomes  equal to      secA + tan A.

This is the hint to us that we must convert the LHS also to secA and tanA .

So  this is how we'll do it.

Divide the LHS numerator and denominator by cos A





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