2sin750°-3cos900°=2sin(360×2+30°)-3cos(360×2+180°)=2sin30°-3cos180°=2×1/2-3×(-1)=1+3=4
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2sin750°-3cos900°=2sin(360×2+30°)-3cos(360×2+180°)=2sin30°-3cos180°=2×1/2-3×(-1)=1+3=4