∫1 / (x² + 4x + 8) dx = ?
Question 1
Q1. ∫1 / (x² + 4x + 8) dx = ?
Answer: (1/2)tan-¹((x + 2)/2) + C
Explanation: Completing the square in denominator, x² + 4x + 8 = (x + 2)² + 4, and using standard integral ∫1 / (u² + a²) du.