已知函数f(x,y,z)=arcsin(x*x+y*y+lnz)求f(x-y,x+y,xz)?

题目

已知函数f(x,y,z)=arcsin(x*x+y*y+lnz)求f(x-y,x+y,xz)?

答案

=arcsin((x-y)^2+(x+y)^2+ln(xz))
=arcsin(2x^2+2y^2+ln(xz))