双曲线y2/4-x2/9=1的渐近线的夹角为?a=2,b=3,渐近线y=±(3/2)x；K₁=3/2,K₂=-3/2；设其夹角为α,那么tanα=(k₁-k₂)/(1+k₁k₂)=(3/2+3/2)/(1-9/4)=3/(-5/4)=-12/5故α=arctan(-12/...