f(x)=e^-(x^2+y^2) 求f'(x)
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f(x)=e^-(x^2+y^2)求f''(x)f(x)=e^-(x^2+y^2)求f''(x)f(x)=e^-(x^2+y^2)求f''(x)两边同时关于x求导e^x-2yy
f(x)=e^-(x^2+y^2) 求f'(x)
f(x)=e^-(x^2+y^2) 求f'(x)
f(x)=e^-(x^2+y^2) 求f'(x)
两边同时关于x求导 e^x-2yy
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