Question

if a(b+c)=119, b(c+a)=128, c(a+b)=128, then find the value of abc​

Answer 1

answers: If `alpha=pi/(15),\ ` then the value of `prod_(r=1)^7cos ralpha` is- a.`1/(128)` b. `1/(128)` c.`1/(64)` d. `1/(32)`