− π 6 {\displaystyle {\frac {-{\cancel {\pi }}}{\ 6}}} ⋅ {\displaystyle \cdot } 2 ⋅ 2 ⋅ 5 ⋅ 3 ⋅ 3 π = − 30 ∘ {\displaystyle {\frac {\ 2\cdot 2\cdot 5\cdot 3\cdot 3}{\cancel {\pi }}}=-30^{\circ }}
