Question

if A,B,C are interior angles of triangle ABC,show that cos^2 A/2+cos^2(B+C/2)=1
plss help me ma maths page is not available plsss help mee frnds....

Answer 1

i will look at this. give me a second. And please verify this is the correct equation\[\cos^{2}(\frac{A}{2})+\cos^{2}(B+\frac{C}{2})=1\]

Answer 2

its\[\cos^{2}(\frac{A}{2})+\cos^{2}(\frac{B+C}{2})=1\]

Answer 3

yaaa

Answer 4

juantweaver go on

Answer 5

i am not sure what to do yet

Answer 6

anyway plss show d method

Answer 7

\[A+B+C=\pi\]\[\frac{B+C}{2}=\frac{\pi}{2}-\frac{A}{2}\]so\[\cos(\frac{B+C}{2})=\cos(\frac{\pi}{2}-\frac{A}{2})=\sin (\frac{A}{2})\]

Answer 8

dis is too complicated
i dnt wanna knw

Answer 9

np :)

Answer 10

thx for ur effort