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By any chance could someone go through the method to solve these? (I think you use U substitution?)

Thanks in advance

(a) integral ((1-z)/(z2 +1))dz

(b) integral ((1)/(z+z2)) dz

(c) integral ((z)/(1-3z2))dz

I tried taking taking the fractions up and solving by parts but that just seems to complicate things further