4. Use the substitution method to evaluate:
(a) â« xsin(3x^2 + 1) dx
(b) â« sin^3 x dx
(c) â« (3x^2 â 1)(2x^3 â x)^â3 dx
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5. Evaluate the following using integration by parts:
(a) â« x sin(3x) dx
(b) 3 â«1 lnx dx