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¶øÇÒ (dx/dy) * (dy/dx) = 1,  
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inv f(x)=¡Ò{1/f'[inv f(x)]} dx

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¡Ò{1/f'[f(x)]} dx = f(x) + c
4Â¥2014-07-05 04:54:45
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2Â¥: Originally posted by Nonsmooth at 2014-07-04 17:53:32
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ÒòΪ y=f(x), ÇÒ x=inv f(y)
¶øÇÒ (dx/dy) * (dy/dx) = 1,  
ÏÖÔÚ²ÉÓÃÀ­¸ñÀÉÈÕ±ê¼Ç·¨,²¢ÇÒ¶¼Óà f(x) ºÍ x À´±íʾ, ¿ÉµÃ: f'(x) * f'[inv f(x)] = 1,  ¼´:
        1/f'(x) = f'[inv f(x)]
µÈʽÁ½±ß»ý·Ö, ¿ÉµÃ:
¡Ò{1/f'(x)]} dx = inv f(x) + c
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