91Ó°ÊÓ

determine two coterminal angles (one positive and one negative) for each angle. Give your answers in degrees. (a) \(45^{\circ} \quad\) (b) \(-36^{\circ}\)

Evaluating Trigonometric Functions In Exercises \(23-30\) , evaluate (if possible) the six trigonometric functions at the real number. $$t=-\pi / 2$$

Use a calculator to evaluate the expression. Round your result to two decimal places. \(\arccos (-0.41)\)

Sketching the Graph of a Trigonometric Function In Exercises \(15-38\) , sketch the graph of the function. (Include two full periods.) $$y=2 \sec 3 x$$

Evaluating Trigonometric Functions. Find the values of the six trigonometric functions of \(\theta\) with the given constraint. $$\begin{array}{ll}{\text { Function Value }} & {\text { Constraint }} \\\ {\sec \theta=-{2}{}} & {\sin \theta<0}\end{array}$$

Angle of Depression A cellular telephone tower that is 150 feet tall is placed on top of a mountain that is 1200 feet above sea level. What is the angle of depression from the top of the tower to a cell phone user who is 5 horizontal miles away and 400 feet above sea level?

Evaluating Trigonometric Functions In Exercises \(23-30\) , evaluate (if possible) the six trigonometric functions at the real number. $$t=-\pi$$

Sketching the Graph of a Trigonometric Function In Exercises \(15-38\) , sketch the graph of the function. (Include two full periods.) $$y=-\frac{1}{2} \tan x$$

determine two coterminal angles (one positive and one negative) for each angle. Give your answers in degrees. (a) \(120^{\circ} \quad\) (b) \(-420^{\circ}\)

Use a calculator to evaluate the expression. Round your result to two decimal places. \(\arcsin (-0.125)\)