[JamesCoe#18]

ข้อ4) ตอบ 0 ใช่ไหมคับ

$\int_{0}^{2\pi}\int_{0}^{\frac{\pi}{3}}\frac{(\rho)^3 }{3}sin\theta d\phi d\theta$

$\int_{0}^{2\pi}\frac{\pi (sin\theta)}{6}d\theta$

$\frac{-\pi cos\theta}{6}$

$-\frac{\pi}{6}[cos2\pi-cos0]$

ตอบ 0