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

Find the principal value of: `cos^(-1)((sqrt(3))/2)`

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Let, `y = cos^-1 (sqrt 3/2)`
`cosy= (sqrt3/2)`
`cosy = cos (pi/6)` `[`since, `cos (pi/6) = sqrt 3/2]`
Then, `y = pi/6`
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