计算:sin(-330°)•tan765°-cos7π2•sin540°+cos(-900°)=______.-数学

题目简介

计算:sin(-330°)•tan765°-cos7π2•sin540°+cos(-900°)=______.-数学

题目详情

计算:sin(-330°)•tan765°-cos
2
•sin540°+cos(-900°)
=______.
题型:填空题难度:中档来源:不详

答案

原式=sin30°tan45°-cosclass="stub"π
2
sin180°+cos180°=class="stub"1
2
×1-0+0=class="stub"1
2

故答案为:class="stub"1
2

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