1.

If S -= x^(2) +y^(2) -2x =0, S' -= x^(2) +y^(2) +3x =0and if overset -( AB )is a direct common tangent to the two circles (A, B are the point of contcact ) then overset- (AB)subtends at origin an angle.

Answer»

`(PI )/(6) `
` ( pi )/(4) `
` ( pi )/(3) `
`( pi )/(2) `

Answer :D


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