V +x² + 4 15-22. Subtle substitutions Evaluate the following integrals. 15. dx ex – 2e 16. dz ez - 4e In°(x²) dx sin'x 17. 18. cos x "cosx dx sin x x(3х + 2) 19. 20. Vx³ + x² + 4 dx dy 21. 22. +1 + y3

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