For the hyperbola `x^2/ cos^2 alpha - y^2 /sin^2 alpha = 1;(0 lt alphalt pi/4)`

For the hyperbola x^2/ cos^2 alpha - y^2 /sin^2 alpha = 1 which of the following remains constant when alpha varies?

For the hyperbola (x^(2))/(cos^(2) alpha ) - (y^(2))/(sin^(2) alpha ) = 1 , where alpha is a parameter, which of the following remains constant ?

For the hyperbola (x^(2))/( cos ^(2) alpha ) -(y^(2))/( sin ^(2) alpha ) =1 Which of the following remains constant when alpha varies ?

For the hyperbola (x^(2))/( cos ^(2) alpha ) -(y^(2))/(sin^(2) alpha ) =1 ,which of the following remains constant when alpha varies?

The foci of the hyperbola (x ^(2))/( cos ^(2) alpha ) -( y ^(2))/( sin ^(2) alpha ) = 1 are

For the hyperbola x^2/(cos^2alpha)-y^2/(sin^2alpha)=1 , which of the following remains constant when alpha varies ?

Given the family of hyperbolas x^(2)/(cos^(2)alpha)-y^(2)/sin^(2)alpha=1" for "alphain(0,pi//2) which of the following does not change with varying alpha ?

If 0 lt alpha lt (pi)/(2) , then which of the following is independent of alpha in the case of the hyperbola (x^(2))/(cos^(2)alpha) - (y^(2))/(sin^(2)alpha) = 1 ?

For hyperbola x^2/(cos^2alpha)-y^2/(sin^2alpha)=1 which of the following remains constant with change in alpha