39there are a 100 answers i can give to this
the question doesnt make sense
recheck it
9 Answers
39
36The word lol (laughing out loud) at the last of my post is a proof to it....
and if someone felt bad over that then dosen't matters me much.......
36???????????????????.............................................
?????????????????????????....................................
my question is that :
if A + B + C = 180°
Then A + B = 180° - C
=> Cos (A + B) = Cos(180° - C) = - Cos C
or, Cos (A + B) = - Cos C
Now it is valid for all values of A, B and C satisfying A + B + C = 1800
So, like this, is there any conversion for cos (A - B)????.... If not then fine......
i don't want 100 or 101 answers to it. I want simply 1.... if someone can...
and no lolz this time... plz...
1cosA.cosB + sinAsinB
-cos(B+C).-cos(A+C) + sin(B+C)sin(A+C)
= cos(B+C).cos(A+C) + sin(B+C)sin(A+C)