∫ 1/2 · R³√(1 + R²) dR
= (1/2)∫ R²√(1 + R²) d(R²/2)
= (1/4)∫ [(R² + 1) - 1]√(1 + R²) d(R²)
= (1/4)∫ [(R² + 1)^(3/2) - √(1 + R²)] d(1 + R...
∫ 1/2 · R³√(1 + R²) dR
= (1/2)∫ R²√(1 + R²) d(R²/2)
= (1/4)∫ [(R² + 1) - 1]√(1 + R²) d(R²)
= (1/4)∫ [(R² + 1)^(3/2) - √(1 + R²)] d(1 + R...