1.

The differential equation of x2 + y2 = a2 is _____ (a) x dy + y dx = 0 (b) y dx – x dy = 0 (c) x dx – y dx = 0 (d) x dx + y dy = 0

Answer»

(d) x dx + y dy = 0

x2 + y2 = a2 

⇒ 2x + 2y(dy/dx) = 0 

⇒ x dx + y dy = 0



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