10. If the line lx+my+n=0 is normal to the ellipse x y =1 then show that...

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10. If the line lx+my+n=0 is normal to the ellipse x y =1 then show that b + a b b 12 m (a2. = 2 a-b) n 11. Solve the locus of a point which moves in such a way that the difference of its distance from two fixed points is constant is Hyperbola. 12. Solve the differential equation x- d'y dy +2y=6x dx dx 13. Solve (xD+xD+1)y=sin(logx) 10. If the line lx+my+n=0 is normal to the ellipse x y =1 then show that b + a b b 12 m (a2. = 2 a-b) n 11. Solve the locus of a point which moves in such a way that the difference of its distance from two fixed points is constant is Hyperbola. 12. Solve the differential equation x- d'y dy +2y=6x dx dx 13. Solve (xD+xD+1)y=sin(logx)