13. 若 \( f(x,y) = \sin(x^2 - y^2) \),試求在 \((x,y) = \left(\frac{\sqrt{\pi}}{2}, \sqrt{\frac{\pi}{6}}\right)\)\(\frac{\partial f}{\partial x} = ?\)
(A) \(\frac{1}{2}\sqrt{\frac{\pi}{2}}(\sqrt{3}-1)\)
(B) \(\frac{1}{3}\sqrt{\frac{\pi}{2}}(1+\sqrt{3})\)
(C) \(\frac{1}{2}\sqrt{\frac{\pi}{2}}(1+\sqrt{3})\)
(D) \(5\sqrt{\pi}\)

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