# What is the slope of the tangent to the curve: y= 6sin2x at x=60 degrees?

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The slope of the tangent to a function is found by taking the derivative of the function, then evaluating at the appropriate value of x.

This means the derivative of `y=6sin2x` is

`y'=12cos2x` using the chain rule

and the slope is found at `x=60^circ=pi/3` which gives

`y'(pi/3)=12cos({2pi}/3)` use the CAST rule

`=12(-1/2)`

`=-6`

**The slope of the tangent is -6**