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Write the value of cos^-1(cos 2π/4).

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Write the value of cos-1(cos \(\frac{2\pi}4\)).

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Given cos -1 (cos 2π/4)

We know that cos-1 (cos θ) = θ

= 2π/4

= π/2

∴ cos-1 (cos 2π/4) = π/2

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