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Additive Identity

If A = x2+y2 ...

Question

If A = {x2+y2 =16} and B ={9x2+25y2=225} . Then n (A U B)= (1) 0 (2) 2 (3) 4 (4) INFINITE

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Q. The length of a common tangent to

x^{2} + y^{2} = 16

9 x^{2} + 25 y^{2} = 225

Q. The eccentricity of the conic

9 x^{2} + 25 y^{2} = 225

Q. The eccentricity of the conic 9x² + 25y² = 225 is
(a) 2/5
(b) 4/5
(c) 1/3
(d) 1/5
(e) 3/5

A = {y : x^{2} + y^{2} < 1, x \in N}

B = {y : x^{2} + y^{2} = 4, x \in N}

n (A \times B)

Q. The angle of intersection of the normals at the point

(- \frac{5}{\sqrt{2}}, \frac{3}{\sqrt{2}})

x^{2} - y^{2} = 8

9 x^{2} + 25 y^{2} = 225

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