Solve the following differential equations:

Now separating variable x on one side and variable y on another side, we have

Re - writing the equation as

Now assuming 1+y2 = t2
Differentiating both sides, we get
ydy = tdt
Similarly, for LHS assuming 1+x2 = v2
differentiating both sides
xdx = vdv
substituting these values in the differential equation
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Integrating both sides
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Re - writing as
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Using identity:
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and
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Integrating both sides, we get
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Substituting the value of v and t in the above equation
