# What is tan(45), sin(45) and cos(45)?

Nov 17, 2017

$\tan \left({45}^{\circ}\right) = 1$
$\sin \left({45}^{\circ}\right) = \frac{\sqrt{2}}{2}$
$\cos \left({45}^{\circ}\right) = \frac{\sqrt{2}}{2}$

#### Explanation:

${45}^{\circ}$ is a special angle, along with ${30}^{\circ}$, ${60}^{\circ}$, ${90}^{\circ}$, ${180}^{\circ}$, ${270}^{\circ}$, ${360}^{\circ}$.

$\tan \left({45}^{\circ}\right) = 1$
$\sin \left({45}^{\circ}\right) = \frac{\sqrt{2}}{2}$
$\cos \left({45}^{\circ}\right) = \frac{\sqrt{2}}{2}$

Here are some other special angles :)