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Find the Exact Value of the Real Number Y y=cos1(22)y = \cos ^ { - 1 } \left( \frac { \sqrt { 2 } } { 2 } \right)

question 481

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Find the exact value of the real number y.
- y=cos1(22) y = \cos ^ { - 1 } \left( \frac { \sqrt { 2 } } { 2 } \right)


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