Algebra Examples

cos (180)

$\cos (180)$

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

$- 1$

Enter a problem...

⎡ ⎢ ⎣ \begin{matrix} x^{2} & \frac{1}{2} \sqrt{π} & \int x d x \end{matrix} ⎤ ⎥ ⎦

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