Question: how to integrate these successfully

a.
charc := 1/exp(-(1/4)*i^2*X^2);
Density := int(exp(-I*X*u)*charc, X = -infinity .. infinity);

b.
charc := 1/(i*X/(exp(i*X)-1))^n;
Density := int(exp(-I*X*u)*charc, X = -infinity .. infinity);

c.
Density := int(exp(-I*X*u)/(((-1+exp(i*X)+p)/(p*exp(i*X)))^y*(1/exp(i*X))^n), X = -infinity .. infinity);

d.
Density := int(exp(-I*X*u)/(ln(exp(i*X))/(exp(i*X)-1))^n, X = -infinity .. infinity);

e.
charc := 1+i*X/(i*X-1);
Density := int(exp(-I*X*u)*charc, X = -infinity .. infinity);

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