Question: Problem 3. With an elementary calculation it can be shown that e-ax cos (bx) dx = a2+b2 Use Feynman' s trick to derive the following

Problem 3. With an elementary calculation it can be shown that

Problem 3. With an elementary calculation it can be shown that e-ax cos (bx) dx = a2+b2 Use Feynman' s trick to derive the following definite integrals: a2-b2 (a2 + b2) xe-ax cos (bx) dx = e-ax sin (bx) dx = a2+b2

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