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Find the principal value of: cos^(-1)(-1...

Find the principal value of: `cos^(-1)(-1/(sqrt(2)))`

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`cos^(-1)(-(1)/(sqrt(2)))=pi-cos^(-1)((1)/(sqrt(2)))=pi-cos^(-1)(cos""(pi)/(4))`
`pi-(pi)/(4)=(3pi)/(4)`
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