File: Calculus Pdf 170571 | Changeofvariablescorral
3 5 change of variables in multiple integrals 117 3 5 changeofvariables in multiple integrals given the difculty of evaluating multiple integrals the reader may be wondering if it is ...
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...Change of variables in multiple integrals changeofvariables given the difculty evaluating reader may be wondering if it is possible to simplify those using a suitable substitution for an swer yes though bit more complicated than method which you learned single variable calculus recall that are example denite integral x dx then would make u du xdx changes limits integration so we get udu can easily integrated give letustakeadifferentlookatwhathappenedwhenwedidthatsubstitution whichwillgive some motivation how works first let ontheinterval function strictly increasing and maps onto hence has inverse dened on interval dene as namely g thensubstituting expression into f gives chapter multipleintegrals andweseethat since performing did earlier whichcanbewrittenas means general one differentiable from youcanthinkofasbeingonthe axis ontoaninterval onthex whichmeans c d andb andd b bf this called formula functions whatyouwereimplicitlyusingwhendoingintegrationbysubstitution thisformulaturns ou...