(1)sin =sin(2π+
)=sin
=
.
(2)cos =cos(4π+
)=cos
=
.
(3)tan( )=tan(-4π+
)=tan
=
.
(4)sin(-765°)=sin［360°×(-2)-45°］=sin(-45°)=-sin45°= .
内容全部来源于网络收集，如有侵权，请联系网站删除！
QQ：24596024