Question

What is the value of $\cos \frac{\mathrm{\pi }}{4}$?

Answer 1

The value of $\cos \frac{\mathrm{\pi }}{4}$ is:

$\cos \frac{\mathrm{\pi }}{4}=\cos 45°$

$\Rightarrow$$\cos \frac{\mathrm{\pi }}{4}=\frac{1}{\sqrt{2}}$

Hence, the value of $\mathit{c}\mathit{o}\mathit{s}\frac{\mathbf{\pi }}{\mathbf{4}}$ is $\frac{\mathbf{1}}{\sqrt{\mathbf{2}}}$.