If "cos"^(-1)alpha+"cos"^(-1)beta+"cos"^...

If `"cos"^(-1)alpha+"cos"^(-1)beta+"cos"^(-1)gamma=3pi`, then find `alpha(beta+gamma)+beta(gamma+alpha)+gamma(alpha+beta)`.

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`6`

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ARIHANT PRAKASHAN-VERY SIMILAR TEST 8-Section B

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