【考研数学】设f(x)可导,F(x)=f(x)(1+|sin x|)则f(0)=0是F(x)在x=0处可导的( )条件
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【考研数学】设f(x)可导,F(x)=f(x)(1+|sin x|)则f(0)=0是F(x)在x=0处可导的( )条件
如题,A.充要 B.充分非必要 C.必要非充分 D.非充分非必要
如题,A.充要 B.充分非必要 C.必要非充分 D.非充分非必要
![【考研数学】设f(x)可导,F(x)=f(x)(1+|sin x|)则f(0)=0是F(x)在x=0处可导的( )条件](/uploads/image/z/18384031-55-1.jpg?t=%E3%80%90%E8%80%83%E7%A0%94%E6%95%B0%E5%AD%A6%E3%80%91%E8%AE%BEf%28x%29%E5%8F%AF%E5%AF%BC%2CF%28x%29%3Df%28x%29%281%2B%7Csin+x%7C%29%E5%88%99f%280%29%3D0%E6%98%AFF%28x%29%E5%9C%A8x%3D0%E5%A4%84%E5%8F%AF%E5%AF%BC%E7%9A%84%EF%BC%88+%EF%BC%89%E6%9D%A1%E4%BB%B6)
用导数的定义
当x趋向于正零时,F(x)在0处的导为:
lim (F(x)-F(0)) / x = lim (f(x) + f(x)sinx - f(0)) / x = lim (f(x) - f(0)) / x + lim f(x)sinx / x = f'(0) + f(0)
当x趋向于负零时,F(x)在0处的导为:
lim (F(x)-F(0)) / x = lim (f(x) - f(x)sinx - f(0)) / x = lim (f(x) - f(0)) / x - lim f(x)sinx / x = f'(0) - f(0)
F(x)在0处可导,则f'(0) + f(0) = f'(0) - f(0),f(0) = 0
当x趋向于正零时,F(x)在0处的导为:
lim (F(x)-F(0)) / x = lim (f(x) + f(x)sinx - f(0)) / x = lim (f(x) - f(0)) / x + lim f(x)sinx / x = f'(0) + f(0)
当x趋向于负零时,F(x)在0处的导为:
lim (F(x)-F(0)) / x = lim (f(x) - f(x)sinx - f(0)) / x = lim (f(x) - f(0)) / x - lim f(x)sinx / x = f'(0) - f(0)
F(x)在0处可导,则f'(0) + f(0) = f'(0) - f(0),f(0) = 0
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