Find the exact value of the expression.
-$$\cos ^ { - 1 } \frac { \sqrt { 2 } } { 2 }$$
A) $\frac { \pi } { 4 }$
B) $\frac { 7 \pi } { 4 }$
C) $\frac { \pi } { 6 }$
D) $\frac { 11 \pi } { 6 }$

Question

Quizplus · Accepted Answer

The value of $\cos^{-1}\frac{\sqrt{2}}{2}$ corresponds to the angle whose cosine is $\frac{\sqrt{2}}{2}$. This is a well-known value that corresponds to $\frac{\pi}{4}$ or 45 degrees in the unit circle.

Find the Exact Value of the Expression cos⁡−122\cos ^ { - 1 } \frac { \sqrt { 2 } } { 2 }cos−122​​

Find the Exact Value of the Expression $\cos ^ { - 1 } \frac { \sqrt { 2 } } { 2 }$