use the fundamental theorem of calculus to find G'(x) if G(x)=

\(\int_{1}^{x^2} cos t dt\)

a. \(G'(x) = \int_{1}^{x^2} -sin t dt\)

b. \(G'(x) = \int_{1}^{x^2} sin t dt\)

c. G'(x) = -2x sin x^2

d. G'(x) = 2x cos x^2

e none of the above