1. ## [SOLVED] Average value?

What is average value of sin x over x = pi to x = 2pi ?
Is it correct?

2. Hi
Originally Posted by fardeen_gen
Is it correct?
Yes it is.

3. Originally Posted by flyingsquirrel
Hi

Yes it is.
Geez, I am really rusty. I'm getting -1/pi.

INT(pi to 2pi)[sinX]dx
= [-cosX](pi to 2pi)
= -cos(2pi) +cos(pi)
= -1 +0
= -1

So average = -1/(2pi -pi) = -1/pi

Can someone please show me how it should be -2/pi?

4. cos pi is -1.

5. Originally Posted by fardeen_gen
cos pi is -1.
Yes, of course!
I was thinking of cos pi/2.

I'd have to shake off more rust flakes from my Math brain.

Thanks.