Question

The period of $\cos x$ is,

• A. $2\mathrm{\pi }$
• B. $\mathrm{\pi }$
• C. $\frac{\mathrm{\pi }}{4}$
• D. None of these.

Answer 1

The correct option is A

$2\mathrm{\pi }$

The explanation for the correct option.

The graph of $\cos x$ is shown below,

From the graph, it is observed that the shape of the curve repeats for every $2\pi$ -unit interval on the x-axis.

Thus, the period is $2\mathrm{\pi }$.

Hence, the option $A$is correct.