( 1 2 , − 3 2 ) {\displaystyle \left({\frac {1}{2}},-{\frac {\sqrt {3}}{2}}\right)}
sin ( t ) = − 3 2 cos ( t ) = 1 2 {\displaystyle {\begin{aligned}\sin {(t)}=-{\frac {\sqrt {3}}{2}}\\\cos {(t)}={\frac {1}{2}}\end{aligned}}}
