(1)sin(-派/2)
=-sin派/2
=-1
(2)sin(5派/4)
=sin(派+派/4)
=-sin派/4
=-√2/2
(3)cos210度
=cos(180度+30度)
=-cos30度
=-√3/2
(4)tan(19派/6)
=tan(3派+派/6)
=tan派/6
=√3/3
(1)sin(-派/2)
=-sin派/2
=-1
(2)sin(5派/4)
=sin(派+派/4)
=-sin派/4
=-√2/2
(3)cos210度
=cos(180度+30度)
=-cos30度
=-√3/2
(4)tan(19派/6)
=tan(3派+派/6)
=tan派/6
=√3/3