Find the remaining trigonometric ratios.
tan (a) = 4, 0<a<pi/2
sin(α)
=cos(α)
=cot(α)
=sec(α)
=csc(α)
=
I would use the Pythagorean identities, keeping in mind all roots will be positive since the angle given is in the first quadrant. For example:
You can now easily find from . Now that you have the three primary functions, finding the rest is straightforward...