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प्रश्न
Find the principal value of `cos^-1 (1/2)`
उत्तर
Let `cos^-1 (1/2)` = π
⇒ cos π = `1/2` = `cos pi/3`
⇒ π = `pi/3`
⇒ `cos^-1 (1/2) = pi/3`
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