sin(-1320°)cos1110°+cos(-1020°)sin750°+cos495°
=sin(-180x8+120)cos(180x6+30)+cos(-180x6+60)sin(4x180+30)+cos(2x180+135)
=sin120cos30+cos60sin30+cos135
=3/4+1/4-√2/2
=1-√2/2
求值 sin(-1320°)cos1110°+cos(-1020°)sin750°+cos495°
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