Algebra Examples

\cos (π)

$\cos (π)$

Step 1

Apply the reference angle by finding the angle with equivalent trig values in the first quadrant. Make the expression negative because cosine is negative in the second quadrant.

- \cos (0)

$- \cos (0)$

Step 2

The exact value of

\cos (0)

$\cos (0)$ is

1

$1$ .

- 1 \cdot 1

$- 1 \cdot 1$

Step 3

Multiply

- 1

$- 1$ by

1

$1$ .

- 1

$- 1$

\cos (π)

$\cos (π)$

(

)

[

]

√



≥

















≤















∩

∪







∞













[\begin{array}{c} x^{2} & \frac{1}{2} \\ \sqrt{π} & \int x d x \end{array}]

$[\begin{array}{c} x^{2} & \frac{1}{2} \\ \sqrt{π} & \int x d x \end{array}]$