Question

(x) cos (A + B) + sin C = sin (A + B) - cos c​

Answer 1

Answer:

A+B+C=180

A+B=180-C

C=180-(A+B)

cos(180-C)+sin(180-(A+B))

cos(180-@)=-sin@ sin(180-@)=sin@

-cosC+sin(A+B)

sin(A+B)-cosC