If `alpha+beta+gamma=2pi` , then

If alpha + beta - gamma =pi, then sin ^(2) alpha + sin^(2) beta- sin ^(2) gamma=

If alpha + beta + gamma=pi, then the value of sin ^(2) alpha + sin ^(2) beta - sin^(2) gamma is equal to

If alpha+beta+gamma=2 pi, then

If alpha+beta-gamma=pi , then sin^2alpha+sin^2beta-sin^2gamma=

If alpha+beta-gamma=pi , then sin^(2)alpha=sin^(2)beta-sin^(2)gamma is equal to

If alpha+beta+gamma=2pi , prove that : cos^2 alpha + cos^2 beta + cos^2 gamma-2cosalpha cosbeta cosgamma=1 .

If alpha + beta + gamma = pi , show that : tan (beta+gamma-alpha) + tan (gamma+alpha-beta) + tan (alpha+beta-gamma) = tan (beta+gamma-alpha) tan (gamma+alpha-beta) tan (alpha+beta-gamma)