let f be a function of one variable, and let w=f(rho), where rho=sqrt(x^2+y^2+z^2) . show that (dw/dx)^2+(dw/dy)^2+(dw/dz)^2=(dw/drho)^2.

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( b ) Let f be a function of one variable and let w= f(p ) , where p=vxty? +z Show that aw 2 aw - 2 dy