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Verified answer
1•Int (2x + 5) dx = x² + 5x + C
2•
Int (x + 3)(x - 3) dx
= Int (x² - 9) dx
= (1/3)x³ - 9x + C
3•
Int √x /(2x) dx
= (1/2) Int x^-1/2 dx
= x^1/2 + C
= √x + C