Does anyone know of any sites that have original textbook like problems for math/physics/chemistry that one could do? I seem to be running out of problems in my text, some of these that I have done more than a few times, its like I am not really doing them anymore, I just recognize the numbers I got before! So I need new ones. Right now I need something with elementary differential equations, but any site containing problems for the above mentioned subjects would be great.(adsbygoogle = window.adsbygoogle || []).push({});

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# Sites containing original problems

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