/ 2 2 2\ |b3 + b4 - b2 | acos|---------------| \ 2*b3*b4 /
acos((b3^2 + b4^2 - b2^2)/(((2*b3)*b4)))
/ 2 2 2\ |b3 + b4 - b2 | acos|---------------| \ 2*b3*b4 /
acos((b3^2 + b4^2 - b2^2)/(2*b3*b4))
acos(b3/(2*b4) + b4/(2*b3) - b2^2/(2*b3*b4))
/ 2 \ | b3 b4 b2 | acos|---- + ---- - -------| \2*b4 2*b3 2*b3*b4/
acos((b3^2 + b4^2 - b2^2)/(((2*b3)*b4)))
acos((b3^2 + b4^2 - b2^2)/(((2*b3)*b4)))
/ 2 \ | b3 b4 b2 | acos|---- + ---- - -------| \2*b4 2*b3 2*b3*b4/
acos(b3/(2*b4) + b4/(2*b3) - b2^2/(2*b3*b4))
/ 2 2 2\ |b3 + b4 - b2 | acos|---------------| \ 2*b3*b4 /
/ 2 2 2\ |b3 b4 b2 | |--- + --- - ---| | 2 2 2 | acos|---------------| \ b3*b4 /
acos((b3^2/2 + b4^2/2 - b2^2/2)/(b3*b4))
/ 2 \ | b3 b4 b2 | acos|---- + ---- - -------| \2*b4 2*b3 2*b3*b4/
acos(b3/(2*b4) + b4/(2*b3) - b2^2/(2*b3*b4))
/ 2 2 2\ |b3 + b4 - b2 | acos|---------------| \ 2*b3*b4 /
acos((b3^2 + b4^2 - b2^2)/(2*b3*b4))
/ 2 2 2\ |b3 + b4 - b2 | acos|---------------| \ 2*b3*b4 /
acos((b3^2 + b4^2 - b2^2)/(2*b3*b4))
/ 2 2 2\ |b3 + b4 - b2 | acos|---------------| \ 2*b3*b4 /
acos((b3^2 + b4^2 - b2^2)/(2*b3*b4))