I was looking at the derivation of the derivative of
tan(x^2 + 5x + y) on the Wolfram|Alpha. I don't understand the last step, which says the derivative of
y is zero.
Shouldn't it be
Here is the link to the derivation: http://www3.wolframalpha.com/Calculate/MSP/MSP4281a2116fh62dgcef100002h2gfc72529d6a10?MSPStoreType=image/gif&s=11&w=478&h=546
Please note that I couldn't post an image. The link above will display the image from the Wolfram|Alpha website.