Without using a calculator, give the exact trigonometric function value with rational denominator.
-$\cos 30 ^ { \circ }$
A) $\frac { 1 } { 2 }$
B) $\frac { \sqrt { 2 } } { 2 }$
C) $\frac { \sqrt { 3 } } { 2 }$
D) $\sqrt { 3 }$

Question

Quizplus · Accepted Answer

The exact value of $\cos 30^\circ$ is $\frac{\sqrt{3}}{2}$, as it is a well-known result from the unit circle and special right triangles.

Without Using a Calculator, Give the Exact Trigonometric Function Value cos⁡30∘\cos 30 ^ { \circ }cos30∘

Without Using a Calculator, Give the Exact Trigonometric Function Value $\cos 30 ^ { \circ }$