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    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. Attachment 522249
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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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    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)
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    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 \displaystyle \int_{0}^{\sqrt{2}} arcosh (x^2 + 1) dx and use integration by parts like you would on  \int \ln x dx
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    (Original post by 16Characters....)
    Go back to \displaystyle \int_{0}^{\sqrt{2}} arcosh (x^2 + 1) dx and use integration by parts like you would on  \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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