7. 若f(x) = x^x^2,則f'(x)是: (A)x^(x^2+1)(2 x+1)(B)x^x^2(2 x+x) (C)x^x^2(2x x+1)(D) x^(x^2+1)( x+2)

8. 若x siny=y sinx,則 \( \frac{dy}{dx} \)是:(A)\( \frac{2x \sin y + y^2 \cos x}{2y \sin x + x^2 \cos y} \)(B) \( \frac{2x \sin y - y^2 \cos x}{2y \sin x + x^2 \cos y} \)(C)\( \frac{2x \sin y + y^2 \cos x}{2y \sin x - x^2 \cos y} \)(D)\( \frac{2x \sin y - y^2 \cos x}{2y \sin x - x^2 \cos y} \)