sincos1 110°+cossin750°+tan495°= .
sin(-1 320°)cos1 110°+cos(-1 020°)sin750°+tan495°=_______________.
在线课程
解析:原式=sin(-4×360°+120°)cos(3×360°+30°)+cos(-3×360°+60°)sin(2×360°+30°)+
tan(360°+135°)
=sin120°cos30°+cos60°·sin30°+tan135°
=
+
×
-1=0.
答案:0
