For example, in spherical coordinates d V = u 1 2 sin ⁡ u 2 d u 1 d u 2 d u 3 {\displaystyle dV=u_{1}^{2}\sin u_{2}\,du_{1}\,du_{2}\,du_{3}} , and so ρ = u 1 2 sin ⁡ u 2 {\displaystyle \rho =u_{1}^{2}\sin u_{2}} .