c4 integration - driving me potty!! Watch

blacklashes
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#21
Report 11 years ago
#21
theres another question i need help with:

x = 4cosθ, y = 3sinθ for 0≤θ≤2pi

Find the volume of the solid of revolution formed when this area is rotated through 2pi radians about the x-axis.

please help

thanks
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*bobo*
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#22
Report 11 years ago
#22
y=3sin(theta)=3(1-cos^2(theta))^0.5=3(1- x^2/16)^0.5
area= pi (bet.0 and 2pi)INT y^2 dx
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