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

If cos^(-1)alpha+cos^(-1)beta+cos^(-1)gamma=3pi , then alpha(beta+gamma)+beta(gamma+alpha)+gamma(alpha+beta) equals to ______

If cos^(-1)alpha+cos^(-1)beta+cos^(-1)gamma=3 pi then alpha beta+beta gamma+gamma alpha equals

If cos^(-1) alpha + cos^(-1) beta + cos^(-1) gamma = 3pi , then alpha (beta + gamma) + beta(gamma + alpha) + gamma(alpha + beta) equal to

If cos^(-1) alpha + cos^(-1) beta + cos^(-1) gamma = 3pi , then alpha (beta + gamma) + beta(gamma + alpha) + gamma(alpha + beta) equal to

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

If alpha+beta=gamma. then cos^(2)alpha+cos^(2)beta+cos^(2)gamma-2 cos alpha cos beta cos gamma=

If alpha+beta=gamma prove that cos^(2)alpha+cos^(2)beta+cos^(2)gamma=1+2cos alpha cos beta cos gamma

cos alpha + cos beta + cos gamma + cos ( alpha + beta + gamma ) =