# Calculus graphing. Urgent help appreciated! [closed] Anonymous

A math student writes a proof of the derivative of a certain trigonometric function. The last line she writes before stating her conclusion is...

d/d?(sin(?+?/2))=cos(?+?/2)

These are the graphs of sin(?+?/2) and cos(?+?/2)

sin(?+?/2)= http://www.wolframalpha.com/input/?i=...

cos(?+?/2)= http://www.wolframalpha.com/input/?i=...

Hence, write the statement of her conclusion beginning with the word, "Therefore...".

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### Closed for the following reason question is off-topic or not relevant by kcrisman close date 2013-05-21 12:24:37

I'll just point out that the down votes are likely because this does not seem to be a [Sage](http://www.sagemath.org)-related question. If you can update it appropriately, please do, otherwise this question should be closed as not relevant.

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Nice homework exercise. I'll have to give that one to my calculus students next time...

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