For the following exercise,

Find the exact value of each trigonometric function.

$$\cos \frac{\pi}{2}$$

For the following exercise,

Let $f(x)=\frac{3}{5} \cos (6 x)$.

What is the smallest possible value for $f(x)$?

For the following exercise,

Find the exact value.

$$\sin \left(\frac{7 \pi}{8}\right)$$

How many electrons does it take to have a total charge of - 1 C?

For the following exercise,

Find the exact value of each trigonometric function.

$$\sin \frac{\pi}{2}$$

What are the products of reaction of (E)-3-methyl-3-hexene with each of the reagents in the indicated problem?

In this exercise, verify the identity.

$$\cos ^2 \frac{\theta}{2}=\frac{\sec \theta+1}{2 \sec \theta}$$

In this exercise, use a calculator to find the value of the trigonometric function to four decimal places.

$$\tan 3.4$$

Verify that each equation is an identity.

$$\cos 2 \theta=\frac{2-\sec ^2 \theta}{\sec ^2 \theta}$$

Find $y^{\prime}$.

$$y=e^{x \sec x}$$

For the following exercise,

Find the exact value.

$$\sec \left(\frac{3 \pi}{8}\right)$$

Graph the function.

y=1+sec x

In this exercise, use a calculator to find the value of the trigonometric function to four decimal places.

$$\csc 1$$

Rewrite $\dfrac{1}{n}\sec^2\left(1 + \dfrac{1}{n}\right) + \dfrac{1}{n}\sec^2\left(1 + \dfrac{2}{n}\right) + \dfrac{1}{n}\sec^2\left(1 + \dfrac{3}{n}\right) + \ldots + \dfrac{1}{n}\sec^2\left(1 + \dfrac{n}{n}\right)$ using sigma notation. Do not evaluate.