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The solution of the equation (1+x2)(1+y)dy+(1+x)(1+y2)dx=0 is
  • a)
    tan⁻1x+log(1+x2)+tan⁻1y+log(1+y2)=c
  • b)
    tan⁻1x-(1/2)log(1+x2)+tan⁻1y-(1/2)log(1+y2)=c
  • c)
    tan⁻1x+(1/2)log(1+x2)+tan⁻1y+(1/2)log(1+y2)=c
  • d)
    none of these
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
The solution of the equation (1+x2)(1+y)dy+(1+x)(1+y2)dx=0 isa)tan1x+l...
The given differential equation is nonlinear, so it cannot be solved using standard techniques like separation of variables. To solve this equation, we can try to rearrange it into a standard form that can be recognized as a known differential equation.
We can rewrite the given equation as:

(1+y)(1+y^2)dy + (1+x)(1+x^2)dx = 0

This equation can be rearranged as follows:

(1+y^2)dy + (1+x^2)dx = -(1+y)(1+x)

This equation can be rewritten as:

dy/dx = (1+x)/(1+y) - (1+y^2)/(1+x^2)

This equation is in the form dy/dx = f(x,y), which is the standard form of a first-order differential equation. This equation can be recognized as a separable differential equation, which means that it can be solved using separation of variables.

To solve this equation using separation of variables, we can isolate the dy term on one side of the equation and the dx term on the other side, and then integrate both sides. This gives:

∫(1+y^2)dy = -∫(1+x)(1+x^2)dx

Solving for y, we get:

tan⁻1y + (1/2)log(1+y^2) = -∫(1+x)(1+x^2)dx + C

Where C is an integration constant.

Similarly, we can solve for x to get:

tan⁻1x + (1/2)log(1+x^2) = -∫(1+y)(1+y^2)dy + D

Where D is an integration constant.

Therefore, the solution of the differential equation is:

tan⁻1x + (1/2)log(1+x^2) + tan⁻1y + (1/2)log(1+y^2) = C + D

This is equivalent to:

c) tan⁻1x+(1/2)log(1+x^2)+tan⁻1y+(1/2)log(1+y^2)=c

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Community Answer
The solution of the equation (1+x2)(1+y)dy+(1+x)(1+y2)dx=0 isa)tan1x+l...
Given equation is (1-x²)(1-y)dy - (1-x)(1-y²)dx = 0.

Separating the variables, we get (1-y)dy/(1-x²) - (1-y²)dx/(1-x) = 0.

Integrating both sides, we get ∫(1-y)dy/(1-x²) = ∫(1-y²)dx/(1-x) + c.

Solving the integrals, we get tan⁻¹x - (1/2)ln(1-x²) = tan⁻¹y - (1/2)ln(1-y²) + c.

Rearranging the terms, we get tan⁻¹x + (1/2)ln(1-x²) - tan⁻¹y - (1/2)ln(1-y²) = c.

Therefore, the correct option is (C) tan⁻¹x + (1/2)ln(1-x²) tan⁻¹y + (1/2)ln(1-y²) = c.
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