\ x/x2 +9 Solve each of the definite integrals in Exercises 79–86. Some integrals require trigonometric substitution, and some do not. 79. xvx' + 4 dx 80. Vx' – 9 dx 5 •2 1 1 dx dx x/9 - x2 81. 82. r1/2 1 83. dx 84. x³V9x2 – 1 dx -1 .2 X³VX2 + 4 dx dx (9 – 2x²)3/2 85. 86.

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