# Samacheer Kalvi 12th Maths Solutions Chapter 8 Differentials and Partial Derivatives Ex 8.7

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## Tamilnadu Samacheer Kalvi 12th Maths Solutions Chapter 8 Differentials and Partial Derivatives Ex 8.7

Question 1.
In each of the following cases, determine whether the following function is homogeneous or not. If it is so, find the degree.

Solution:

It is not a homogeneous function

∴ It is a homogeneous function with degree 3.

∴ It is homogeneous function of degree 0.

∴ It is not a homogeneous function

Question 2.
Prove that f(x, y) = x3 – 2x2 y + 3xy2 + y3 is homogeneous; what is the degree? Verify Euler’s Theorem for f.
Solution:
f (x, y) = x3 – 2x2y + 3xy2 + y3
f(tx, ty) = t3x3 – 2(t2x2)(ty) + 3(tx)(t2y2) + t3y3
= t3 [x3 – 2x2y + 3xy2 + y3]
f(tx, ty) = t3 f(x, y)
‘f’ is a homogeneous function of degree 3. By Euler’s theorem, we have

∴ Euler’s Theorem verified

Question 3.
Prove that g(x, y) = x log ($$\frac{y}{x}$$) is homogeneous; what is the degree? Verify Euler’s Theorem for g.
Solution:

∴ Euler’s Theorem verified

Question 4.

Solution:

Question 5.

Solution:

∴ ‘f’ is a homogeneous function of degree 1. By Euler’s theorem, we have

Question 6.

Solution:

### Samacheer Kalvi 12th Maths Solutions Chapter 8 Differentials and Partial Derivatives Ex 8.7 Additional Problems

Question 1.

Solution:

Question 2.

Solution:
R.H.S. is not a homogeneous and hence