Prove: sin θ - sin θ cos2 θ = sin3 θ

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Brad Wilson · Answer 1 · 2017-09-17T07:01:03+0000

t - Theta
sin t - sin t cos² t = sin³ t
sin t ( 1 - cos² t ) = sin³ t
sin t · sin² t = sin³ t
sin³ t = sin³ t ( correct )