Let's ____ (see) the pandas first. They're my favorite animals.
若cos(α+β)=45,cos(α﹣β)=﹣45,3π2<α+β<2π,π2<α-β<π,则sin2β=____
①对顶角相等;②相等的角是对顶角;③若两个角不相等,则这两个角一定不是对顶角;④若两个角不是对顶角,则这两个角不相等