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May 24, 2015

Homework Help: Calculus

Posted by sh on Sunday, March 21, 2010 at 11:02pm.

Find the derivative of y with respect to x:
y=(1+cos²x)^6
y'=6(1+cos²x)^5

How do you derive inside the brackets? The answer says -sin2x, but wouldn't it be -2sinx, using the chain rule.

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