Question

The value of $\cos 60^\circ$ is:

• A. $\dfrac{\sqrt{3}}{2}$
• B. $\dfrac{1}{\sqrt{2}}$
• C. $\dfrac{1}{2}$
• D. $1$

Hint:

Always remember the standard trigonometric ratios for $0^\circ, 30^\circ, 45^\circ, 60^\circ, 90^\circ$. They are frequently asked in exams.

Answer 1

The Correct Option is C

Step 1: Recall standard trigonometric values
From the trigonometric table:
\[ \cos 0^\circ = 1,\ \cos 30^\circ = \frac{\sqrt{3}}{2},\ \cos 45^\circ = \frac{1}{\sqrt{2}},\ \cos 60^\circ = \frac{1}{2},\ \cos 90^\circ = 0 \]

Step 2: Apply for $\cos 60^\circ$
Clearly, \[ \cos 60^\circ = \frac{1}{2} \] \[ \boxed{\cos 60^\circ = \tfrac{1}{2}} \]