sin(5θ/2)*cos(θ/2)怎么化成sin(5θ/2+θ/2)+sin(5θ/2-θ/2)

问题描述:

sin(5θ/2)*cos(θ/2)怎么化成sin(5θ/2+θ/2)+sin(5θ/2-θ/2)