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If ax + by = 1 is a tangent to the hyperbola x^2/a^2 - y^2/b^2 = 1, then the value of a^2 - b^2 is

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If ax + by = 1 is a tangent to the hyperbola x2/a2 - y2/b2 = 1, then the value of a2 - b2 is

(a) 1/e2 - a2 

(b) e2a2/1

(c) 1

(d) 1/e2a2

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Correct option: (d) 1/e2a2 

Explanation:

The line y = mx + c is tangent to hyperbola

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