1. ## Integral Help

Hi ALL !!!

Someone can help me with this question ??

$\int_{\frac{\pi}{2}}^{\fracp{x}{2}}\sin(\cos(t))dt$

I thought use that:

$\sin(\cos(t)) = \cos(\frac{pi}{2} - \cos(t))$

Is it correct ??

Thanks a lot...

2. ## Re: Integral Help

Originally Posted by Borseti
Hi ALL !!!

Someone can help me with this question ??

$\int_{\frac{\pi}{2}}^{\fracp{x}{2}}\sin(\cos(t))dt$

I thought use that:

$\sin(\cos(t)) = \cos(\frac{pi}{2} - \cos(t))$

Is it correct ??
is the integral ...

$\int_{\frac{\pi}{2}}^{\frac{x}{2}}\sin(\cos(t))dt$

???

... and what are you supposed to do with it?

3. ## Re: Integral Help

I've done !!!

I use that sin(cos(t)) is a primitive of F(t), then $\int_{\frac{pi}{2}}^{\frac{x}{2}} \sin(\cos(t))dt = F(\frac{x}{2}) - F(\frac{pi}{2})$.