20. Prove the identity:

Asked by  | 15th Feb, 2009, 12:41: PM

Expert Answer:

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





Answered by  | 16th Feb, 2009, 11:17: AM

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