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Evaluating Integrals via Substitution

Thank you in advance for your help.

Evaluate the integrals by making the given substitution:
(a)The integral of x(4+x^2)^3dx; (u=4+x^2)
(b)The integral of ((sin sqrt[x])/sqrt[3x])dx; (u=sqrt[x])
(c)The integral of e^(3sin(t))cos(t)dt; (u=sin(t))

Solution Summary

Substitution is used to Evaluate Integrals. The response received a rating of "5" from the student who originally posted the question.