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Wolfram|Alpha is a "computational knowledge engine" developed by Wolfram Research, announced in March of 2009. It is unique in that in answers queries with direct computational results, rather than bringing up a page of documents and various webpages as most search engines do.

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Derivative of tan(f(x,y))

As you can see the derivative of tan(x^2 + 5x + y) is (5+2 x) sec^2(5 x+x^2+y) as you can see that you have not explicitly stated that y is a function of w. So wofram alpha assumes y to be constant, a …
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