1.

If thetais an angle between the two asymptotes of the hyperbola (x^(2))/(a^(2))-(y^(2))/(b^(2))=1 then cos (theta)/(2) is equal to

Answer»

`(b)/SQRT(a^(2)+b^(2))`
`(ab)/sqrt(a^(2)+b^(2))`
`(a)/sqrt(a^(2)+b^(2))`
`sqrt((a-b)/(a+b))`

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