If `e` is the eccentricity of `x^2/a^2-y^2/b^2=1` and `theta` be the angle between its asymptotes, then `cos(theta/2)` is equal to

If e is the eccentricity of (x^(2))/(a^(2))-(y^(2))/(b^(2))=1 & theta be the angle between the asymptotes, then sec theta//2 equals

If e is the eccentricity of the hyperbola (x^(2))/(a^(2))-(y^(2))/(b^(2))=1 and theta is the angle between the asymptotes, then cos.(theta)/(2) is equal to

V'el'is the eccentricity of the hyperbola (x^(2))/(a^(2))-(y^(2))/(b^(2))=1 and theta is the angle between its asymptotes.The value of sin((theta)/(2)) is (A) (sqrt(e^(2)-1))/(sqrt(e^(2)-1))(C)sqrt((e^(2)+1)/(e^(2)-1))(D)sqrt((e^(2)-1)/(e^(2)+1))

The angle between the asymptotes of (x^(2))/(a^(2))-(y^(2))/(b^(2))=1 is equal to