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Delhi University MCA Previous Year Questions (PYQs)

Delhi University MCA Geometry PYQ



The locus of the point (α, β) such that the line y = αx + β, become a tangent to the hyperbola  9x- 4x = 36, is





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The area (in squares units) of the quadrilateral formed by the tangent lines drawn to the ellipse  at the ends of its two latus rectums is





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The equation 2x2 + y2 - 12x - 4y + 16 = 0 represents





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The equation of common tangent to the curve y2 = 8x and xy = - 1 is





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Solution

Solution:

Let the common tangent be: y=mx+c
For curve y2=8x:
Condition for tangency gives: mc=2(1)
For curve xy=1:
Condition for tangency gives: c2=4m(2)
Substitute c=2m from (1) into (2): (2m)2=4m4m2=4mm3=1m=1
Then, c=21=2

Final Answer:
y=x+2







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