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प्रश्न
Find the principal value of `cos^-1 sqrt(3)/2`
उत्तर
Let y = `cos^-1 (sqrt(3)/2)`
Where 0 ≤ y ≤ π
cos y = `sqrt(3)/2`
= `cos (pi/6)`
y = `pi/6`
∴ The principal value of `cos^-1 sqrt(3)/2 = pi/6`
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