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计算： sin60°-cos45°+
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2cos30°+sin60°+2tan45°•tan60°.
函数Cos60°+ψ展开式为
Cos60° Cosψ +Sin60° Sinψ
Cos60° Cosψ -Sin60° Sinψ
Sin60° Cosψ -Cos60° Sinψ
Sin60° Cosψ +Cos60° Sinψ
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°。
求下列各式的值．tan45°·sin60°-4sin30°·cos45°+·tan30°．
计算tan260°﹣2sin30°﹣cos45°.
计算4cos30°﹣3tan60°+2sin45°•cos45°.
sin2450+cos2450+tan300tan600+sin600cos300;
计算tan60°-cos45°·sin45°+sin30°
计算cos45°+3tan30°+cos30°+2sin60°-2tan45°
计算2cos230°﹣2sin60°×cos45°.
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cos45°﹣tan30°•sin60°．
sin230°+cos245°+sin60°·tan45°
计算cos45°－tan30°·sin60°.
sin60°－cos45°＋
sin230°+cos245°+sin60°·tan45°
计算sin60°×cos45°
计算2sin30°﹣4sin45°•cos45°+tan260°.
6.00分计算3tan230°+sin60°﹣cos45°
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高一下学期数学
教案备课库
高一上学期数学
高一上学期化学
教案备课库
教案备课库
sin30°
cos45°； tan30°
tan60°。 
sin30°
cos45°； tan30°
tan60°。 
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