Find F '(x) for F(x) = integral[x^3 to 1](cos(t^4)dt)
a. cos(x^7)
b. cos(x^12)
c. 3x^2cos(x^12)
d. cos(1)  cos(x^12)
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1 answer

By the 2nd FTC,
F' = cos((x^3)^4)(3x^2) = 3x^2cos(c^12)
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answered by Steve
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