sin(x/2)﹣ cos(x/2)= 更号2
问题描述:
sin(x/2)﹣ cos(x/2)= 更号2
答
[sin(x/2)-cos(x/2)]²=sin²(x/2)+cos²(x/2)-2sin(x/2)cos(x/2)=1-sin(2*x/2)=2
sinx=-1
x=3π/2+2kπ,k∈整数