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Anyone give me working out - ans is supposedly 901/960 pi but I can’t come close
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How did you do part a? Just do what you did there but square all terms and multiply by pi
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find the integral normally,square it and then multiply by π/2 and you get the volume of the solid of revolution with 180 degrees  rotation
remember,you're essentially finding infinite (half,in this case) circles,each of which has a radius equal to the integral at every point

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