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CBSE Class 12 Math 2023 Delhi Set 1 Solved Paper

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Question : 38 of 38
Marks: +1, -0
Case Study-III
An equation involving derivatives of the dependent variable with respect to the independent variables is called a differential equation. A differential equation of the form dydx=F(x,y)\frac{dy}{dx} = F(x, y) is said to be homogeneous if F(x,y)F(x, y) is a homogeneous function of degree zero, whereas a function F(x,y)F(x, y) is a homogenous function of degree nn if F(λx,λy)=λnF(x,y)F(\lambda x, \lambda y) = \lambda^{n} F(x, y). To solve a homogeneous differential equation of the type dydx=F(x,y)=\frac{dy}{dx} = F(x, y) = g(yx)g\left(\frac{y}{x}\right), we make the substitution y=vxy = v x and then separate the variables. Based on the above, answer the following questions :
(I) Show that (x2−y2)dx+2xydy=0(x^2 - y^2) dx + 2xy dy = 0 is a differential equation of the type dydx=g(yx)\frac{dy}{dx} = g\left(\frac{y}{x}\right).
(II) Solve the above equation to find its general solution.
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