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The sides of a triangle inscribed in a given circle subtend angles α, β and γ at the centre.

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The sides of a triangle inscribed in a given circle subtend angles α, β  and γ at the centre. The minimum value of the arithmetic mean of cos(α + π/2), cos(β + π/2) and cos (γ + π/2) is equal to ....

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Since, sides of a triangle subtends α, β  and γ at the centre.

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