In a triangle ABC , prove that sin B-C2=b - cacos A2 .

In a triangle ABC , prove that $\sin \frac{B - C}{2} = \frac{b - c}{a} \cos \frac{A}{2}$ .

Matching exercise

Match the items on the right to the items on the left.

STEP 1

STEP 2

STEP 3

STEP 4

STEP 5