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Free webinar on Robotics (Block Chain) Learn to create a Robotic Device Using Arduino
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Prove that tan²2x - tan²x / 1- tan²2x tan²x = tan3x tanx Prove that tan²2x - tan²x / 1- tan²2x tan²x = tan3x tanx
(tan²2x - tan²x) / (1- tan²2x tan²x)= [(tan2x - tanx)*(tan2x + tanx)]/[(1- tan2x tanx)*(1+ tan2x tanx)]= [(tan2x - tanx)/(1+ tan2x tanx)]*[(tan2x + tanx)/(1- tan2x tanx)]=(tan2x-x)*(tan2x+x)=tanx*tan3x
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