1.

The sides of a triangle inscribed in a given circle subtend angles alpha, beta, gamma at the centre then minimum value of Arithmetic mean of cos(alpha+pi//2), cos beta+pi//2)cos (gamma+pi//2)

Answer»

`(SQRT(3))/(2)`
`(2PI)/(3)`
`(sqrt(2))/(3)`
`-(sqrt(3))/(2)`

ANSWER :D


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