differential equation

solve the differential equation
x dx + y dy + (x²+y²) dy = 0

1 Answers

1357

Manish Shankar ·2008-11-25 09:31:49

x dx + y dy + (x²+y²) dy = 0

(1/2)d(x²+y²)+(x²+y²)dy=0

d(x²+y²)/(x²+y²)=-2dy

ln(x²+y²)=-2y + c

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