d tet dx 1+e* , xe" + e* – e 2x A (1+e*)? xe" +e* +e2« B (1+e*) 2 xe* + e2* (1+e*)? (1+e*)xe* – ¢2« D (1+e*)?

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Q: 13. To evaluate f 2costx-1 dx, the integrand can be transformed to 1-sin²x a. [(3cos³x+csc²x)dx b.…

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