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December 22, 2014

December 22, 2014

Posted by **adil ahmed** on Wednesday, December 2, 2009 at 6:50pm.

cos2x=1-sinx

also cosx=cosx-1

and please also sin2x=3sinx

- maths please answer NOW!!!!! -
**bobpursley**, Wednesday, December 2, 2009 at 6:57pmIsn't cos2x=cos^2x-sin^2x=1-2sin^2 x ?

put that into the left side, gather terms, and you have a quadratic equation.

The second makes no sense.

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