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Homework Statement
Find the equation of the tangent to the curve y=2cos^3x at x=pi/3
Homework Equations
The Attempt at a Solution
y=2cos^3x
dy/dx=-6sinxcos^2x
0=-6sinxcos^2x
set x = pi/3 and solve for the derivative, plug the answer into y=2cos^3x
where do I go from here?
Do I take that value of the slope and use the points found by pi/3 and use m=y2-y1/x2-x1?
Thanks