find the remaining 5 trigometric functions of x

Question

cos x = 1/5, x in quadrant 1

Answer 1

Construct a triangle,
you know cosx = adjacent / hypotenuse, so let the opposite be y
y^2 + 1^2 = 5^2
y = +√24 in the first quadrant.

You now have the opposite, the adjacent and the hypotenuse.
Use the definitions of the trig ratios you learned to answer your question.