25sin平方θ+sinθ-24=0
(25sinθ-24)(sinθ+1)=0
sinθ=24/25或者sinθ=-1(不合题意舍去因为θ为第二象限角)
cosθ=-[1-(24/25)*(24/25)]^(1/2)=-7/25
2cos(θ/2)*cos(θ/2)-1=-7/25
cos(θ/2)*cos(θ/2)=9/25
所以cos(θ/2)=3/5或-3/5