In Exercises 15-32, evaluate using trigonometric substitution. Refer to the table of trigonometric integrals as necessary. x² dx dt 15. / 16. / J (16 – 1239/2 V9 – x2 dx 18. V12+412 dt 17. x/x² + 16 dx 20. 12V12 – 25 I PR- 19. 2 -9

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