Вариант 7. 1) ∫ from -2 to 2 (x² - 6x) dx; 2) ∫ from 2 to 5 (8 - x²) dx; 3) ∫ from 0 to 2 (4x³ + x - 5) dx; 4) ∫ from 0 to π/4 (3dx / cos² x); 5) ∫ from -2 to 2 (dx / (x + 3)²).