求值:sin14π3+cos(-25π4)=______.-数学

题目简介

求值:sin14π3+cos(-25π4)=______.-数学

题目详情

求值:sin
14π
3
+cos(-
25π
4
)
=______.
题型:填空题难度:中档来源:不详

答案

sinclass="stub"14π
3
+cos(-class="stub"25π
4
)
=sin(4π+class="stub"2π
3
)+cos(6π+class="stub"π
4
)
=sinclass="stub"2π
3
+cosclass="stub"π
4
=
3
+
2
2

故答案为:
3
+
2
2

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