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What is the derivative of cosx??

- sin x

|dw:1342100312222:dw|

Or you can use Euler's Identities to prove it...

thanks to every one i got the ans!!!!!!

I can Google you a proof in less than five seconds. I don't have to prove anything to you.

That is what she is asking...
Google???
What else you can do...

OH, she wants the PROOF. For all we know, the title may have suggested a geometric interpretation.

I think a word known as WHY is sufficient for all the things...

LOL