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11. Find center, length of axes, eccentricity and directrices of the conic 3x+8xy-3y2-40x-20y+50=0 OR 12 Describe and sketch the conic r= 2-6cos0 12. Deduce

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11. Find center, length of axes, eccentricity and directrices of the conic 3x+8xy-3y2-40x-20y+50=0 OR 12 Describe and sketch the conic r= 2-6cos0 12. Deduce standard equation of ellipse. 13. Solve the differential equation: (1+ y)+(x-etan 14. Solve: xp2-2yp+ ax = 0 where p: 15. Solve: dy dy +3- +2y=ex.sinx dx dx dy dx dy =0 dx

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