原式=-sin(360*3+240)cos(360*3+30)+cos(2*360+300)sin(360*2+30)+tan(360+135)
=-sin240cos30+cos300sin30+tan135
=sin60cos30+cos30sin30-tan45
=4分之（根号3-1）
sin(-1320)cos1110+cos(-1020)sin750+tan495的值.
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