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Write the principal value of cos^(-1)(co...

Write the principal value of `cos^(-1)(cos680^0)dot`

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`cos^-1(cos 680^@) `
As, `680= 360 + 320`
so, `cos^-1[cos(360+320)]`
`cos^-1 [ cos(360 - 40)] `
`cos^-1[cos(40)]`
`cos^-1[cos(40 xx pi/100)]`
`cos^-1[cos((2pi)/9)]`
`(2pi)/9`
...
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