Ans. y= xy- xyz +3y + (3/2) 2 col 53. if u is a differentiable function of x,y,z , prove vu. dr = du . 15 & altferentiable function of x,y,z ,t where x,),z are

Ans. y= xy- xyz +3y + (3/2) 2 COl 53. If U is a differentiable function of x,y,z , prove VU. dr = dU . 15 & altferentiable function of x,y,z ,t where x,),z are differentiable functions of t, prove that EV F. d dE 70. If A:ty2 at the int dt dt