Prove each identity a) cosx tan^3x= sinx tan^2x do i do 1-2sin^2x 2tanx/1-tan^2x = sinx tan^2x
Last edited by Skoz; Dec 2nd 2009 at 04:25 PM.
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Originally Posted by Skoz Prove each identity a) cosx tan^3x= sinx tan^2x do i do 1-2sin^2x 2tanx/1-tan^2x = sinx tan^2x ??? $\displaystyle \cos{x} \cdot \tan^3{x} = \cos{x} \cdot \frac{\sin^3{x}}{\cos^3{x}} = \frac{\sin^3{x}}{\cos^2{x}} = \sin{x} \cdot \frac{\sin^2{x}}{\cos^2{x}} = \sin{x} \cdot \tan^2{x}$
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