Like when we go to the library and we ask..hmmm I wonder what the derivative of this function is. The librarian then charges us a flat pointing rate and she points to the math section. We then walk over to the calculus book section. We open the book and look for derivatives. Then it starts charging us by the word...but it's very fast. You can even say the words to make it output sounds. With that you can then solve your math problem and go home. Next time you can purchase the same book or remember it. You can solve the next equation for free!
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