Solve each equation for x if 0 http://upload.wikimedia.org/math/6/a...5c0f8773f9.png x http://upload.wikimedia.org/math/a/f...c58796ddf7.png 2π give your answers in radians using exact values only.

sin x = -cos 2x

I need help :)

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- May 6th 2009, 03:23 PMineedmathhelp08trigonometry equations help
Solve each equation for x if 0 http://upload.wikimedia.org/math/6/a...5c0f8773f9.png x http://upload.wikimedia.org/math/a/f...c58796ddf7.png 2π give your answers in radians using exact values only.

sin x = -cos 2x

I need help :) - May 6th 2009, 03:40 PMReferos
Try using the identity $\displaystyle cos2x = 1-2sin^2{x}$.