(2-2cosθ)/(3-2sinθ) 求化简
问题描述:
(2-2cosθ)/(3-2sinθ) 求化简
答
这些知识早生疏了!
(2-2cosθ)/(3-2sinθ)
=2*2sin²(θ/2)/ (3-2*2sin(θ/2)cos(θ/2))注解(3=3(sin²(θ/2)+cos²(
=4tan²(θ/2)/(3+3tan²(θ/2)-4tan(θ/2)) θ/2))
分子分母同时除以cos²(θ/2)