Calcule:
(a) integral 1x^2-4 d x
(b) integral xx^2-5 x+6 d x
© integral 2 x+1x^2-1 d x
(d) integral x+1x(x-2)(x+3) d x
(e) integral x^2+3 x+1x^2-2 x-3 d x

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