91Ó°ÊÓ

In Exercises 29–44, graph two periods of the given cosecant or secant function. $$ y=\frac{1}{2} \csc \frac{x}{2} $$

Find a cofunction with the same value as the given expression. $$ \sin 7^{\circ} $$

In Exercises 29–44, graph two periods of the given cosecant or secant function. $$ y=2 \sec x $$

find the reference angle for each angle. $$ 170^{\circ} $$

find the reference angle for each angle. $$ -150^{\circ} $$

find the reference angle for each angle. $$ -250^{\circ} $$

find the reference angle for each angle. $$ 565^{\circ} $$

find the reference angle for each angle. $$ \frac{23 \pi}{4} $$

A ship is 9 miles east and 6 miles south of a harbor. What bearing should be taken to sail directly to the harbor?

Use a calculator to find the value of the acute angle \(\theta\) in radians, rounded to three decimal places. $$ \cos \theta=0.4112 $$