PDF chapter test TRY NOW
Prove the following identites.
(i) \(\frac{sin \ A - sin \ B}{cos \ A + cos \ B} + \frac{cos \ A - cos \ B}{sin \ A + sin \ B} = 0\)
(ii) \(\frac{sin^3 \ A + cos^3 \ A}{sin \ A + cos \ A} + \frac{sin^3 \ A - cos^3 \ A}{sin \ A - cos \ A} = 2\)
Important!
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