sinaθ=(m-3)/(m+5),cosa=(4-2m)/(m+5),π/2<θ<π,则m=
问题描述:
sinaθ=(m-3)/(m+5),cosa=(4-2m)/(m+5),π/2<θ<π,则m=
答
π/2<θ<π,
sinA>0,cosA0
m3
(4-2m)/(m+5)