$12 {\sin }^2\left(x\right)-5 \sin \left(x\right)-3$

$12{\sin \left(x\right)}^2-5\sin \left(x\right)-3$

$\mathrm{Student}\left[\mathrm{Calculus1}\right]\left[\mathrm{Roots}\right]\left(\,0..2 \mathrm{\π}\right)$

$\left[\arcsin \left(\frac{3}{4}\right)\,-\arcsin \left(\frac{3}{4}\right)\+\mathrm{\π}\,\arcsin \left(\frac{1}{3}\right)\+\mathrm{\π}\,-\arcsin \left(\frac{1}{3}\right)\+2\mathrm{\π}\right]$

$\mathrm{evalf}\left(\right)$

$\left[0.8480620790\,2.293530575\,3.481429564\,5.943348398\right]$