# Volume of a solid

• Jul 25th 2009, 11:04 AM
acosta0809
Volume of a solid
Th question is :
Consider the region bounded by y = cos(x), y = 0, x = 0, and x = http://www.webassign.net/images/pi.gif/4. Rotate the region around the x-axis. Sketch the region. Write an integral giving the volume of the solid. Give your answer using the form below. http://www.webassign.net/www31/symIm...c290e33169.gif

What i got was that A=0 B=pi/4 and the integral is pi*cos(x)^2 dx
Im not sure if this is correct can anyone double check me please? thanks
• Jul 25th 2009, 11:30 AM
Jester
Quote:

Originally Posted by acosta0809
Th question is :
Consider the region bounded by y = cos(x), y = 0, x = 0, and x = http://www.webassign.net/images/pi.gif/4. Rotate the region around the x-axis. Sketch the region. Write an integral giving the volume of the solid. Give your answer using the form below. http://www.webassign.net/www31/symIm...c290e33169.gif

What i got was that A=0 B=pi/4 and the integral is pi*cos(x)^2 dx
Im not sure if this is correct can anyone double check me please? thanks

Looks good to me. :)
• Jul 25th 2009, 11:37 AM
acosta0809
Im doing my homework on this web program named web assign and i tried to input the answer as pi*(cos(x))^2 but it keeps saying its wrong, does anyone have experience with this program am i entering it in a format it does not like?
• Jul 25th 2009, 02:04 PM
mr fantastic
Quote:

Originally Posted by acosta0809
Im doing my homework on this web program named web assign and i tried to input the answer as pi*(cos(x))^2 but it keeps saying its wrong, does anyone have experience with this program am i entering it in a format it does not like?

Perhaps you're meant to evaluate the integral and submit what you get as your answer.