Evaluate each integral using a substitution. Clearly show the full substitution and be sure your limits always match the

Question

Evaluate each integral using a substitution. Clearly show the full substitution and be sure your limits always match the variable of integration.
(a) ∫(1+tant)³ sec² t dt   [0,π/4]
(b) ∫e^ x/1+e^ 2x   [0,1]
(c)∫ sin(In x)√1+(In x)²/(x) dx [e,1/e]

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