1.

C : x^(2) + y^(2) - 2x -2ay - 8 = 0, a is a variable If the chord joining the fixed points substends an angle theta at the centre of the circle C_(1). Point of chord of contact lies on the line x+ 2y + 5 = 0. then theta equals

Answer»

`30^(@)`
`45^(@)`
`60^(@)`
`90^(@)`

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