Evaluate the following three quantities: sin ( 5 π 3 ) {\displaystyle \sin \left({\frac {5\pi }{3}}\right)} , cos ( − π 3 ) {\displaystyle \cos \left(-{\frac {\pi }{3}}\right)} , tan ( 11 π 3 ) {\displaystyle \tan \left({\frac {11\pi }{3}}\right)} .
