1.

The solution of x dx + y dy = 0 is _____ (a) x2 + y2 = c (b) x/y = c (c) x2 – y2 = c (d) xy = c

Answer»

(a) x2 + y2 = c 

x dx = -y dy 

x2/2 = -y2/2 + c1

x2 + y2 = c



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