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Answer each of the following questions in one word or one sentence or as per exact requirement of the question:
Write the value of .
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
∴ sin-1 (cos π/9) = 7π/18