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OpenStudy (anonymous):
derivative tan(x+y)=x , there are 2 answers showed. One is -sin^2(x+y) , which i understood. But one more answer is -x^2/(x^2+1), why?
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OpenStudy (abb0t):
the second answer has no trig function?
OpenStudy (anonymous):
i really have no idea.
OpenStudy (abb0t):
strange.
OpenStudy (anonymous):
yeah.
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