i) cos 306° + cos 234° + cos 162° + cos 18° = 0
Answers
Answered by
11
Answer:
0
Step-by-step explanation:
cos306°+cos234°+cos162°+cos18°
=cos(360°+54°)+cos(180°+54°)+cos(180°-18°)+cos18°
=cos54°-cos54°-cos18°+cos18°
=0
Answered by
0
Answer:
0
Step-by-step explanation:
cos 306°+ cos 234°+cos 162°+cos 18°
= cos(360-54)+cos(180+54)+cos(180-18)+cos 18
= cos 54 - cos 54 - cos 18 +cos 18
= 0
Similar questions