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Solve cos theta=1//3....

Solve `cos theta=1//3`.

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The correct Answer is:
`theta=2npi pm cos^(-1) 1/3, n in Z`
`cos theta=1//3` or `cos theta=cos^(-1) (cos 1//3)`
`rArr theta=2n pi pm "cos"^(-1) 1/3, n in Z`
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