(1) 先对g(x)求导,得g(x)'=-1/(sinθx^2)+1/x=(sinθx-1)/(sinθx2)>=0,因sinθ>0,x2>0,所以sinθx-1>=0
所以x>=1/sinθ,因x>=1,所以1>=1/sinθ,sinθ=1,θ=π /2
(2)g(x)=1/x+lnx,f(x)=mx-(m-1)/x-lnx求θ
m=0 f(x)=1/x-lnx f'(x)=-1/x^2-1/x>0 (1/x)(1/x+1)
(1) 先对g(x)求导,得g(x)'=-1/(sinθx^2)+1/x=(sinθx-1)/(sinθx2)>=0,因sinθ>0,x2>0,所以sinθx-1>=0
所以x>=1/sinθ,因x>=1,所以1>=1/sinθ,sinθ=1,θ=π /2
(2)g(x)=1/x+lnx,f(x)=mx-(m-1)/x-lnx求θ
m=0 f(x)=1/x-lnx f'(x)=-1/x^2-1/x>0 (1/x)(1/x+1)