化简sin5π/4＋sin(﹣π)＋cos9π/4
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化简sin5π/4＋sin(﹣π)＋cos9π/4化简sin5π/4＋sin(﹣π)＋cos9π/4化简sin5π/4＋sin(﹣π)＋cos9π/4sin5π/4＋sin(﹣π)＋cos9π/4=-
化简sin5π/4＋sin(﹣π)＋cos9π/4
化简sin5π/4＋sin(﹣π)＋cos9π/4
化简sin5π/4＋sin(﹣π)＋cos9π/4
sin5π/4＋sin(﹣π)＋cos9π/4
=-sin(π/4)+0+cos(π/4)
=-√2/2+√2/2
=0
sin5π/4＋sin(﹣π)＋cos9π/4
=-sinπ/4-sinπ+cosπ/4
=0
化简sin5π/4＋sin(﹣π)＋cos9π/4
计算：sinπ／12 sin5π／12
(sin5π/12-sinπ/12)(sin5π/12+sinπ/12)的值 急!
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sinπ /14*sin3π /14*sin5π /14
sin5π/3=sin(2π-π/3)
sinπ/18sin5π/18 sin（- 65π/18 sin之间为乘法sinπ/18sin5π/18 sin（- 65π/18sin之间为乘法
SIN5/6π
三角函数值sin5π/4=sin(5π/4-2π)=?算不出来 要怎么算呢?
(sinπ/12)-(sin5π/12)+(2sinπ/8)(sin3π/8)
sinπ/12-sin5π/12+2sinπ/8sin3π/8
比较大小：sin5分之8π ( )sin5分之9π
sin5/6π等于多少?
(sin5π/12+cos5π/12)(sinπ/12-cosπ/12)
(sin5π/12-sinπ/12)(cos5π/12+cosπ/12)=?
sinπ /14*sin3π /14*sin5π /14答案是1/8
计算sinπ/12*sin5π/12我没有分了,知道的人就帮帮忙,
sin（-π/3）+2sin5/3π+3sin2/3的值等于?