计算:2sin30°+2cos60°+3tan45°=______.
题型:不详难度:来源:
计算:2sin30°+2cos60°+3tan45°=______. |
答案
2sin30°+2cos60°+3tan45° =2×+2×+3×1 =5. |
举一反三
△ABC中,∠C=90°,tanA=1,则sinB的值是( ) |
已知α为锐角,tan(90°-α)=,则α的度数为( ) |
(1)sin30°+cos45°; (2)sin260°+cos260°-tan45°. |
已知α为锐角,且tan(90°-α)=1,则α的度数是______度. |
计算: (1)sin230°+cos245°+sin60°•tan45° (2)sin45°+cos30°•tan60°-. |
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