cos 24° + cos 55° + cos 125° +cos 204° =
-1
0
1
2
Answers
Answered by
0
cos 24+cos55+cos125+. +cos204
Answered by
4
Answer:
lhs =cos 24+cos 55+cos 125+cos 204+cos 300
= cos 24 +cos 55 +cos (180-55)+cos (180-24)+cos(270+30)
= cos 24 +cos 55-cos 55-cos24+sin30
=sin 30
=1/2
=rhs
Similar questions