Use the identity cos 2x = cosx * cos x - sin x * sin x to find the derivative of cos 2x. Express the derivative in terms of sin 2x.

I have no idea how to do this.

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- Nov 15th 2007, 09:01 PMTruthbetoldTrigonometric Derivative using Identity
Use the identity cos 2x = cosx * cos x - sin x * sin x to find the derivative of cos 2x. Express the derivative in terms of sin 2x.

I have no idea how to do this. - Nov 15th 2007, 09:04 PMJhevon
- Nov 15th 2007, 09:18 PMTruthbetold
- Nov 15th 2007, 09:25 PMJhevon