Maths-
General
Easy
Question
If 
then 
- 1
- 2
- 3
- 4
Hint:
We are given a function u. It is a function of three variables. We have to find the value of 
. We will take the partial derivative of the function w.r.t to the variables and multiply with the respective variables. Then we will add them up.
The correct answer is: 3
The given function is u=log(x3+y3+z3-3xyz)
We have to find the value of
It means we have to find the value of 
For simplification we will write u=logv
v = x3 + y3 + z3 -3xyz
We will take the partial derivative of u w.r.t all three variables.
Now, we will substitute all the values in the .
The required answer is 3.
The variable v is used just for simplification. When we take partial derivative w.r.t to certain variable, we keep other variables constant.
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