How do you find the derivative of y = cos 2x?

If we differentiate cos x we get – sin x

When we differentiate cos 2x we get – sin 2x but then have to differentiate 2x.

This can be written as y = cos 2x d y/ d x = − sin 2 x . d/ d x ( 2 x ) = − sin 2 x . 2 d y/ d x = − 2 sin 2 x

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