Respuesta :

Answer:

±3/5.

Step-by-step explanation:

sinθ = 1/ csc θ

= 1 / 1 1/4

= 1 / 5/4

= 4/5.

Here we have a 3-4-5 right triangle with θ opposite the longest leg.

So cos θ = 3/5.

Also if θ is in the second quadrant  the cosθ = -3/5.