(a) For the triangle in the accompanying figure, use trigonometry to show that
b cos γ + c cos β = a
c cos α + a cos γ = b
a cos β + b cos α = c
and then apply Cramer's rule to show that

(b) Use Cramer's rule to obtain similar formulas for cos β and cos γ.

Transcribed Image Text:

cosa ite2 2bc