Find the equation of the line tangent to the graph of y = cos(2x) at x = pi/4

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Find the equation of the line tangent to the graph of y = cos(2x) at x = pi/4

Mathematics
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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at x=pi/4, y=0 find the derivative y'=-2sin2x sub pi/4 to y' y'=-2 which is the slope of the line Thus, the equation of the tangent is y=-2x+b, sub in values to find b In the end, the equation you should get is y=-2x+pi/2
What values do I put in to find b?
I got -2 + 0

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use x=pi/4 and y=0

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