In triangle abc, which trigonometric ratio has the value a/c?

a) tan a
b) cos a
c) tan c
d) cos c
e) sin c

we know that

In the right triangle ABC

therefore

the answer is the option A

is means division by fractions

step-by-step explanation:

let's first notice, the center of the hyperbola is at the origin, since the focus points are equidistantly 3 units away from the origin, that also means that the distance "c" from the center to either focus is 3.

it should also be notable that, the traverse axis for this hyperbola is vertical, or namely over the y-axis and therefore, the positive fraction will be the one with y-variable.

the traverse "a" component or distance from the center to either vertex is not 2, is more than 2, so we can safely put it at √5 ≈ 2.24.