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Find the principal value of cos^(-1)(-(1)/(sqrt2))". " Note: Input in radians.

Find the principal value of\newlinecos⁡−1(−12).  \cos ^{-1}\left(-\frac{1}{\sqrt{2}}\right) \text {. } \newlineNote: Input in radians.

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Inverses of sin, cos, and tan: radiansright chevron icon

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