Find the exact value of the real number y.
-$$y = \cos ^ { - 1 } \left( \frac { \sqrt { 2 } } { 2 } \right)$$
A) $\frac { 7 \pi } { 4 }$
B) $\frac { \pi } { 4 }$
C) $\frac { \pi } { 6 }$
D) $\frac { 11 \pi } { 6 }$

Question

Quizplus · Accepted Answer

The value of $\cos^{-1}\left(\frac{\sqrt{2}}{2}\right)$ corresponds to the angle in the first quadrant whose cosine value is $\frac{\sqrt{2}}{2}$, which is $\frac{\pi}{4}$.

Find the Exact Value of the Real Number Y y=cos⁡−1(22)y = \cos ^ { - 1 } \left( \frac { \sqrt { 2 } } { 2 } \right)y=cos−1(22​​)

Find the Exact Value of the Real Number Y $y = \cos ^ { - 1 } \left( \frac { \sqrt { 2 } } { 2 } \right)$