Trigonometry Examples

\cos (315 °)

$\cos (315 °)$

Step 1

Apply the reference angle by finding the angle with equivalent trig values in the first quadrant.

\cos (45)

$\cos (45)$

Step 2

The exact value of

\cos (45)

$\cos (45)$ is

\frac{\sqrt{2}}{2}

$\frac{\sqrt{2}}{2}$ .

\frac{\sqrt{2}}{2}

$\frac{\sqrt{2}}{2}$

Step 3

The result can be shown in multiple forms.

Exact Form:

\frac{\sqrt{2}}{2}

$\frac{\sqrt{2}}{2}$

Decimal Form:

0.70710678 \dots

$0.70710678 \dots$