Question

cos^2(alpha) + cos^2(beta) + cos^2(gamma) = 1

apha=110 beta=138.6 , find gamma

 

Answer 1

cos^2(alpha) + cos^2(beta) + cos^2(gamma) = 1

cos^2(110) + cos^2(138.6) + cos^2(gamma) = 1

0.117+0.563+ cos^2(gamma) = 1

cos^2(gamma)=0.32

cos(gamma)=0.5657

gamma=55.55