Differentiate the following function.
f(x)=9x^7-9sinx...I got my answer to be 63x^6+9cosx..im not sure where i got it wrong

Question

Differentiate the following function. 
f(x)=9x^7-9sinx...I got my answer to be 63x^6+9cosx..im not sure where i got it wrong

anonymous · Answer

the - sign

anonymous · Answer

63x^6-99cosx

anonymous · Answer

yes you can

anonymous · Answer

9cosx*

anonymous · Answer

the derivative of sine is cosine.   the derivative of -sine is - cosine

anonymous · Answer

you just forgot the minus sign. thats all

anonymous · Answer

what rubin said

anonymous · Answer

Yeah, its an addition (of a negative :P) so you can just do it term by term.

anonymous · Answer

so the answer is right..just gotta reverse the sign

anonymous · Answer

Yup :)

anonymous · Answer

The derivative of sin(x) is cos(x) so you don't need to flip the sign :P

anonymous · Answer

well thanks again

anonymous · Answer

No problem :P As many as you need, calculus <333 lol

anonymous · Answer

However, I won't be able to help you again for about 45 minutes. Because I am being called away. But I shall return xP

anonymous · Answer

lol you should help with everything!! i understand it but the only thing i get stuck on is you know like the ln fucntion and all

anonymous · Answer

ok : )

anonymous · Answer

Well I can explain that to you no problem :) Just give me a bit :P Try a bunch of them and then I can help you check them or explain them.

anonymous · Answer

I'm back rmalik if you need help :P