how do i set this up?

Question

Use a calculator to solve the following equation for θ on the interval [−90∘,90∘].

csc(θ)=−5/4

Answer 1

Solve for θ: csc θ = -5/4

1 / sin θ = -5/4

sin θ = -4/5

θ = sin^-1 (-.8)

θ = -53.13 degrees

Answer 2

csc θ = -54

sin θ = -0.0185

sin^-1 -0.0185 = -1.06