sin(2x+ π/3)乘cos(2x+π/3)等于
问题描述:
sin(2x+ π/3)乘cos(2x+π/3)等于
答
sin(2x+ π/3)*cos(2x+π/3)=(1/2)sin2*(2x+ π/3)
=(1/2)sin(4x+ 2π/3)
正弦的倍角公式