1.

prove that tan3x•tan2x•tanx = tan3x-tan2x-tanx.

Answer»

From 3x = 2x + xApplying tan on both sides..tan3x = tan (2x+x)tan3x = (tan2x+tanx)/1-tan2x tanx(1-tan2x tanx)tan3x = tan2x+tanxtan3x - tanx tan2x tan3x = tan2x+tanxtanx tan2x tan3x = tan3x-tan2x-tanx

Hence it is proved..

thanks



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