问题标题：
【化简:(sinα)^2+(sinβ)^2-(sinα)^2(sinβ)^2+cos2αcos2β】
问题描述：
化简:(sinα)^2+(sinβ)^2-(sinα)^2(sinβ)^2+cos2αcos2β
刘良田回答：
sinα=(1-cos2α)/2
(sinα)^2+(sinβ)^2-(sinα)^2(sinβ)^2+cos2αcos2β
=(1-cos2α)/2+(1-cos2β)/2-(1-cos2α)/2*(1-cos2α)/2+cos2αcos2β
=(1+cos2αcos2β)*0.75
点击显示
数学推荐
热门数学推荐