tan3xtan2xtanx =tan3x-tan2x-tanx
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we know 3x =2x+xtan3x= tan(2x+x)tan3x= tan2x+tanx\\1-tan2x tanxtan3x-tan3xtan2xtanx =tan2x+tanx tan3x-tan2x-tanx = tan3x tan2x tanx tan3xtan2xtanx=tan3x-tan2x-tanx