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Write the value of sin-1 (cos \(\frac{\pi}9\)). |
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Answer» Given sin-1 (cos π/9) We know that cos θ = sin (π/2 – θ) = sin-1 (sin (π/2 - π/9)) = sin-1 (sin 7π/18) We know that sin-1 (sin θ) = θ = 7π/18 ∴ sin-1 (cos π/9) = 7π/18 |
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