Question

Please answer this
I will mark Brainliest​

Answer 1

sin=a/b+c

cos^2= 1- a^2/(b+c)^2

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

cos= √{( b+c)^2-a^2}/(b+c)^2

=1/b+c√[{(b+c)^2-a^2}×4bc/4bc]

=2√bc/(b+c). cosA/2

I think that you will mark.....

Answer 2

here is your answer please Mark brainliest