Question

Plz prove the question...​

Answer 1

Answer:

use Cosine Rule

Step-by-step explanation:

c-((b^2 +c^2-a^2)/2c))=(c^2+a^2-b^2)/2c

(2b^2-b^2-c^2+a^2)/2b

now this is CosB.a/CosC.a=cosB/cosC

Answer 2

"HOPE IT HELPS

" PLEASE MARK ME BRAINLIEST ☺️