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May26,2021
$f(x)f'(x)$的原函数辅助函数$F(x)=f^2(x)$ $\[f'(x)]^2+f(x)f''(x)$的原函数辅助函数$F(x)=f(x)f'(x)$ $f'(x)+f(x)\phi'(x)$的原函数辅助函数$F(x)=f(x...