simplify : sin theta - 2sin cube theta / 2 cos cube theta - cos theta
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(sin∅-2sin³∅)/(2cos³∅-cos∅)
=sin∅(1-2sin²∅)/cos∅(2cos²∅-1)
=sin[1-2+2cos²∅]/cos∅(2cos²∅-1)
=sin∅(2cos²∅-1)/cos∅(2cos²∅-1)
=sin∅/cos∅
=tan∅
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