设函数z=f(x2-y2),f(u)二阶可导,则() A.f'(x2-y2)(2x-
题型:单项选择题
问题:
设函数z=f(x2-y2),f(u)二阶可导,则()
A.f'(x2-y2)(2x-2y)
B.f’(x2-y2)(4xy)
C.f(x2-y2)(-4xy)
D.f''(x2-y2)(4xy)
设函数z=f(x2-y2),f(u)二阶可导,则()
A.f'(x2-y2)(2x-2y)
B.f’(x2-y2)(4xy)
C.f(x2-y2)(-4xy)
D.f''(x2-y2)(4xy)