Question
Determine the slope of the tangent to the curve $y=\cos 2 x$ at point $\left(\frac{\pi}{6}, \frac{1}{2}\right)$.
Step 1
The derivative of $\cos x$ is $-\sin x$, and by the chain rule, the derivative of $\cos 2x$ is $-2\sin 2x$. So, $y'=-2\sin 2x$. Show more…
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