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Find the slope of the line tangent to the curve y=cos(2x) at the point where x=pi/6

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  1. dy/dx = -2sin(2x)
    when x = π/6
    slope = dy/dx = -2sin (π/3) = -2(√3/2) = -√3

    when x = π/6, y = cos(π/3) = 1/2

    so you have the point (π/6 , 1/2) and the slope of -√3

    Find the equation of the tangent using your favourite method.

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