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求值:sin60°×cos45°+2sin30°-tan60°+tan45°
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2cos30°+sin60°+2tan45°•tan60°.
如图所示在数轴上点
所表示的数x的范围是( ) A.
sin30°
cos30°
cos45°;
tan30°
3cos60°
tan60°。
计算tan260°﹣2sin30°﹣cos45°.
计算4cos30°﹣3tan60°+2sin45°•cos45°.
sin2450+cos2450+tan300tan600+sin600cos300;
tan45°sin45°﹣2sin30°cos45°+tan30°=
2sin30°·tan30°+cos60°·tan60°
下列结论中正确的有①sin30°+sin30°=sin60°②sin45°=cos45°③cos25
为锐角,且sinA.=cos28°,则∠A.=62°. A.1个
2个
3个
4个
如图所示在数轴上点
所表示的数x的范围是( ) A.
sin30°
cos30°
cos45°;
tan30°
3cos60°
tan60°。
计算2sin30°+2cos60°+3tan45°=_______.
计算2sin30°+cos45°-tan60°.
sin230°+cos245°+sin60°·tan45°
sin30°﹣cos45°2+tan45°.
求2sin30°+3cos60°-4tan45°的值.
6tan230°-sin60°-2cos45°=__________________.
计算cos45°-tan30°·sin60°.
sin60°+cos30°-3tan300×tan450
计算2sin30°+4cos30°•tan60°﹣cos245°.
sin230°+cos245°+sin60°·tan45°
计算2sin30°﹣4sin45°•cos45°+tan260°.
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