sin(cosx)不小于0,所以cosx属于[0,1],x属于[-π/2+2kπ,π/2+2kπ],k为任意整数,
√sin(cosx)值域为[0,√sin1]
cos(sinx)不小于0,所以sinx属于[-1,1],x属于R,√cos(sinx)值域为[0,√cos1]