首页 > 2sin217π4+cos13π3tan(-7π4)+cos3π2=______．-数学

2sin217π4+cos13π3tan(-7π4)+cos3π2=______．-数学

题目简介

2sin217π4+cos13π3tan(-7π4)+cos3π2=______．-数学

题目详情

2sin2
17π
4
+cos
13π
3
tan(-
7π
4
)+cos
3π
2
=______．
题型：填空题难度：中档来源：不详

答案

2sin2class="stub"17π
4
+cosclass="stub"13π
3
tan(-class="stub"7π
4
)+cosclass="stub"3π
2

=2sin2(4π+class="stub"π
4
)-cos (4π+class="stub"π
3
)tan(2π-class="stub"π
4
)+cos (π+class="stub"π
2
)
=2sin2class="stub"π
4
+cosclass="stub"π
3
tanclass="stub"π
4
-cosclass="stub"π
2
=1+class="stub"1
2
-0=class="stub"3
2
．
故答案为：class="stub"3
2
．

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