LOOK AT PICTURE
WILL MARK BRAINIST ASAP
Use a graphing calculator to solve the equation in the interval from 0 to $2 \pi$. Round to the nearest hundredth.
$
4 \cos (t)=3
$
2. Verify the Pythagorean Identity.
Recall these helpful relations:
$1+\cot ^2 \theta=\csc ^2 \theta$
$
\begin{array}{l}
\sin ^2 \theta+\cos ^2 \theta=1 \\
\cot \theta=\cos \theta / \sin \theta=1 / \tan \theta \\
\csc \theta=1 / \sin \theta
\end{array}
$
3. The water level varies from 10 inches at low tide to 40 inches at high tide. Low tide occurs at 9:15 a.m. and high tide occurs at 3:30 p.m. What is a cosine function that models the variation in inches above and below the water level as a function of time in hours since. 9:15 a.m.?
( 9 points)