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solve : z=x+y+f(x,y)

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  MATHS z=x+y+f(x,y)

solve : (p-q)(z-px-qy)=1

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  MATHS solve : (p-q)(z-px-qy)=1

solve : z=px+qy+p^2(q^2)

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  MATHS solve : z=px+qy+p^2(q^2 )

Clairaut equation.

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MATHS Clairaut equation

solve : p-x^2=q+y^2

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  MATHS solve: p-x^2=q+y^2

solve : p^2+q^2=x^2+y^2

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  MATHS solve: p^2+q^2=x^2+y^2

solve : p^2+q^2=x+y

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  MATHS p^2+q^2=x+y