1.

Form a differential equation representing the given family of curves by eliminating arbitrary constant a and b.y2 = a (b2 – x2)

Answer»

y2 = a (b2 – x2

Differentiating w.r.t x, we get 

= yy, = -ax ………(1) 

differentiating again 

yy2 + yy1 = -a …(2) 

putting value of (-a) from (2) in (1) 

yy1= (yy2 + y1y1) x 

⇒ yy, = x (y12 + yy2) which is required differential equation. 



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