Evaluate the integral. x² - 81 | V=² x x² - 81 | Vx² x √x². 81 X √x². 81 X x² - 81 X 1² 1² - dx = - dx = -dx -dx = = - dx = 9sin ¹(-). 9 9cos-1 X +9cos¯ '¹(5). - COS +9sin √x² - 81 √x² - 81 √x²-81 X √x². - 81 9 X √x² - 81 + C + C + C ¹ (7) + + C ¹ (²) + c C

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