# Calculus graphing. Urgent help appreciated! [closed]

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...".

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.