Question

Find the value of $\cos \left(\frac{\mathrm{\pi }}{3}\right)$

Answer 1

Finding the value of $\cos \left(\frac{\mathrm{\pi }}{3}\right)$

We know that $\mathrm{\pi }=180°$

So it can be written as

$\begin{array}{rcl}\cos \left(\frac{\mathrm{\pi }}{3}\right)& =& \cos \left(\frac{180°}{3}\right)\\ & =& \cos 60°\end{array}$

From the table, we know that

$\cos 60°=\frac{1}{2}$

Hence the value of $\cos 60°=\frac{1}{2}$