sin260°+cos260 (2)-tan450
(3)cos45°-sin30° (4)sin2300+cos2300
(5)tan45°-sin30°·cos60° (6)
(7)2sin300-cos450 (6)sin600cos600 (8)2sin30°+3cos60°-4tan45°
(9)cos30°sin45°+sin30°cos45° (10)
cos30°+sin45° (12)2sin300+3sin600-4tan450
(13)tan300sin450+tan600cos450 (14)
(15);
(16)=________________
(19)sin230°+cos245°+sin60°·tan45°; (20)+ sin45°
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(40)sin45°+3tan30°+4cos30°
(41)cos260°-tan45°+sin60°·tan60°.
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