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February 20th, 2012, 05:03 PM   #1
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notation and volume integration

sorry if this is in the wrong section but i am doing a math problem which says f(x)=cosx and g(x)=secx for x ? ] -pi/2, pi/2 [
what are these reverse brackets?

edit : i am having problem with this problem.
Let R be the region enclosed by the two graphs. the Region r is rotated through 2pi about the x axis to generate a solid.
a) write down an integral which represents the volume of this solid.
b) hence find the exact value of the volume.

i have tried to find the integral using the cylinder method, but i am having trouble. i have done
integral of sec(x)*cos(x)*2*(2pi-x)
although this is a dy problem and now i am stuck
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February 21st, 2012, 02:33 AM   #2
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Re: notation and volume integration

[color=#000000]
Quote:
Let R be the region enclosed by the two graphs. the Region r is rotated through 2pi about the x axis to generate a solid.
a) write down an integral which represents the volume of this solid.
b) hence find the exact value of the volume.
If and with and the rotation is made about the x-axis then you have to use the disc method,
but this integral does not converge![/color]
ZardoZ is offline  
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