30乘以sin15度的积再除以二分之根号三等于多少?
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/07/29 01:31:15
30乘以sin15度的积再除以二分之根号三等于多少?
![30乘以sin15度的积再除以二分之根号三等于多少?](/uploads/image/z/4458620-20-0.jpg?t=30%E4%B9%98%E4%BB%A5sin15%E5%BA%A6%E7%9A%84%E7%A7%AF%E5%86%8D%E9%99%A4%E4%BB%A5%E4%BA%8C%E5%88%86%E4%B9%8B%E6%A0%B9%E5%8F%B7%E4%B8%89%E7%AD%89%E4%BA%8E%E5%A4%9A%E5%B0%91%3F)
sin15°=根号[(1-cos30°)/2]=根号[(2-根号3)/4]=1/2(根号3-1)/根号2
30sin15°/[(根号3)/2
=30*1/2*(根号3-1)/跟号2*2/根号3
=30(根号3-1)/根号6
=30/根号2-30/根号6
=15根号2-5根号6
30sin15°/[(根号3)/2
=30*1/2*(根号3-1)/跟号2*2/根号3
=30(根号3-1)/根号6
=30/根号2-30/根号6
=15根号2-5根号6