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The Brainliest Answer!
2016-03-13T00:12:38+05:30
First convert whole the LHS with respect in SinA and CosA. then when you will get a equation in cubic form use the for of a3-b3 (3=degree 3). you will hav something as common after that u will get ur proof=RHS.
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thank u so much for marking ot as brainliest