Answer:
-√[374,2]\20
Step-by-step explanation:
You take sin⁻¹ 20⁄29 to get your θ value of 0,7610127542, then plug this into the cosecant function to get this:
csc -0,7610127542 ≈ -√[374,2]\20
I hope this this is correct, and helps you out alot, and as always, I am joyous to assist anyone at any time.