计算：sin(-330°)•tan765°-cos7π2•sin540°+cos_爱下问搜题

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问题填空题

计算：sin(-330°)•tan765°-cos

7π

2

•sin540°+cos(-900°)=______．

答案

原式=sin30°tan45°-cos

π

2

sin180°+cos180°=

1

2

×1-0+0=

1

2

．

故答案为：

1

2

选择题

I think people must have found it quite_____delight when colour TV was first broadcast in___1920s.

A．不填; the

B．a; 不填

C．a; the

D．不填; 不填

问答题简答题

简述希伯来文学的意义及影响。