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प्रश्न
Evaluate:
`cos{sin^-1(-7/25)}`
उत्तर
`cos{sin^-1(-7/25)}=cos{-sin^-1(7/25)}`
`=cos{sin^-1(7/25)}`
`=cos{cos^-1sqrt(1-(7/25)^2)}`
`=cos{cos^-1 24/25}`
`=24/25`
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