(1)∵-3π≤x≤-2π，∴-1≤cosx≤1，即-1≤y≤1∴y=cosx的反函数是：y=arccosx (-1≤x≤1)(2)∵y=arcsin√(2x+1)∴siny=√(2x+1)≥0而-π/2≤y≤π/2，∴0≤y≤π/2∴(siny)^2=2x+1∴x=1/2*(siny)^2-1/2即反函数为：y=1/2*(sinx)^2-1/2 (0≤x≤π/2)望采纳
