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FP3 Area of Surface of revolution

Hi everyone

Can any one tell me if I am doing the right thing for Q 7 c). I am stuck up to hear. Have no idea what to do next.
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Thanks.


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This isn't surface area of revolution - just standard integration.
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Original post by B_9710
This isn't surface area of revolution - just standard integration.


Opps! Thanks very much


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Original post by 123321123
Opps! Thanks very much


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ImageUploadedByStudent Room1460576341.291579.jpg
Hi I still don't know how to do the simple integration. Could you explain a bit to me plz? Thanks


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Original post by 123321123
ImageUploadedByStudent Room1460576341.291579.jpg
Hi I still don't know how to do the simple integration. Could you explain a bit to me plz? Thanks


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Go back to ∫02arcosh(x2+1)dx\displaystyle \int_{0}^{\sqrt{2}} arcosh (x^2 + 1) dx and use integration by parts like you would on ∫ln⁡xdx \int \ln x dx
Original post by 16Characters....
Go back to ∫02arcosh(x2+1)dx\displaystyle \int_{0}^{\sqrt{2}} arcosh (x^2 + 1) dx and use integration by parts like you would on ∫ln⁡xdx \int \ln x dx


Basically this.
Remember, if you can integrate x multiplied by the function's derivative, then you can integrate the function itself (using parts with 1 and the function).
So working out dy/dx should serve as a hint/help for the integration.

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