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प्रश्न
Find the value, if it exists. If not, give the reason for non-existence
`sin^-1 (cos pi)`
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उत्तर
`sin^-1 (cos pi) = sin^-1(- 1)`
= `- sin^-1 (1)`
= `- pi/2` ......[∵ cos π = – 1]
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