# Calculus

posted by
**sh**
.

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.

posted by
**sh**
.

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.