f(x)=x√(x²-16),求f''(5)
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f(x)=x√(x^2-16)
f'(x) =√(x^2-16) + x^2/√(x^2-16)
=2√(x^2-16) + 16/√(x^2-16)
f''(x) =2x/√(x^2-16) - 16x/(x^2-16)^(3/2)
f''(5)
=10/3 - 80/27
=10/27
f'(x) =√(x^2-16) + x^2/√(x^2-16)
=2√(x^2-16) + 16/√(x^2-16)
f''(x) =2x/√(x^2-16) - 16x/(x^2-16)^(3/2)
f''(5)
=10/3 - 80/27
=10/27
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