f(g(x))
=e^(arcsing(x))
=x-1
∴arcsing(x)=ln(x-1)
g(x)=sin[ln(x-1)]
首先g(x)的值域是y=arcsinx里的定义域,即g(x)∈[-1,1]
g(x)的定义域是x-1＞0,并且-π/2≤ln(x-1)≤π/2,
即x∈(1,+∞),且1+e^(-π/2)≤x≤1+e^(π/2)
所以定义域是取交集[1+e^(-π/2),1+e^(π/2)]