如果函数y=f(x)在x=0处得导数存在,且f(x)=f(-x)求f‘(0)的值
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如果函数y=f(x)在x=0处得导数存在,且f(x)=f(-x)求f‘(0)的值
f(x) = f(-x)
f'(0-)= lim(y->0-) { [f(y) - f(0)]/y }
= lim(y->0-) { [f(-y) - f(0)] / (y) }
= -lim(y-> 0-) { [f(-y) - f(0)]/ (-y) }
= -lim(-y-> 0+){ [f(-y) - f(0)]/ (-y) }
= - f'(0+)
f'(0) => f'(0+) = f'(0-)
=> f'(0)= 0
f'(0-)= lim(y->0-) { [f(y) - f(0)]/y }
= lim(y->0-) { [f(-y) - f(0)] / (y) }
= -lim(y-> 0-) { [f(-y) - f(0)]/ (-y) }
= -lim(-y-> 0+){ [f(-y) - f(0)]/ (-y) }
= - f'(0+)
f'(0) => f'(0+) = f'(0-)
=> f'(0)= 0
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