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Find the value of ` cos^(-1) ( cos . (2pi)/3) + sin^(-1) ( sin . (2pi)/3)`.

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The value of cos⁡〖π/2^2 ∙cos⁡〖π/2^3 …cos⁡〖π/2^10 〗∙sin⁡〖π/2^10 〗 〗 〗 is | Trigonometric Functions

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