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# My input log(f'(x)) doesn't equal Wolfram Alpha's answer: possible debug solution

Posted 6 months ago
 Dear person, INPUT/My Question: log(f'(x)) does NOT Equal Wolfram Alphas Answer ??= OUTPUT: d/dx(log(f'(x))) = (f''(x))/(f'(x)) -TIP, Proof by contradiction using substitution:When run f(x)=e^x AKA f(x)=Euler-e^x through Left Equation see X Does NOT EQUAL ONE (1) SO log(f'(x)) NOT EQUAL - d/dx(log(f'(x))) = (f''(x))/(f'(x)) I believe Wolfram Alpha site, or maybe Mathematica on backend, mistakenly moves the innermost dx to outside the outermost parentheses? Given that e^x is its own integral and derivative, maybe you want to always substitute f(x)=e^(x) to always check your answers? Best Regards,Marc Cox Ps> If you find merit in this, let Stephen Wolfram / Community know please because I love to help. :-) 
 Your input log(f'(x)) is not a question. What did you expect as an answer?I just tried log(f'(x)) as input in Wolfram|Alpha. The software attempts to say something pertinent about your input. There is a section called Derivative, where it gives d/dx(log(f'(x))) = (f''(x))/(f'(x)), which is in fact the derivative of your input.