Answer
H
Work Step by Step
Recall: $\csc\theta=\frac{1}{\sin\theta}$
Using degree mode and sine function, we can find $\sin80^{\circ}$ and then its inverse to get $\csc80^{\circ}$.
$\csc80^{\circ}=\frac{1}{\sin80^{\circ}}\approx1.015426612$
The appropriate approximation is H.
