sin(12分之π)﹣根3×cos（12分之π）的值
问题描述：
sin(12分之π)﹣根3×cos（12分之π）的值
答
sin(π/12)-√3cos(π/12)
=2(1/2sin(π/12)-√3/2cos(π/12))
=2sin(π/12-π/3)
=2sin(-π/4)
=-√2