Question

The value of $co{s}^2{30}^{\circ }-{\cos }^2{60}^{\circ }-\cos {60}^{\circ }$ is

• A. 0
• B. $\frac{1}{2}$
• C. $\frac{3}{4}$
• D. 1

Answer 1

The correct option is A 0

$cos{30}^{\circ }=\frac{\sqrt{3}}{2}$

$cos{60}^{\circ }=\frac{1}{2}$

Putting the value to get value

$=\frac{3}{4}-\frac{1}{4}-\frac{1}{2}=0$