cos2x-根号下3乘sin2x=?
问题描述:
cos2x-根号下3乘sin2x=?
答
cos2x-根号下3乘sin2x
=2(1/2cos2x-√3/2sin2x)
=2(sinπ/6cos2x-cosπ/6sin2x)
=2sin(π/6-2x)-2sin(2x-��/6)