[微積] 微分
令f:R^3 -> R, a = (a1,a2,a3), b = (b1,b2,b3) 屬於R^3
假設f之2次偏導函數為連續函數
令y(t) = f( a + t( b - a ) )
求y'(1) and y''(1)
感謝
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