wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

The sum cos1o+cos2o+cos3o+....+cos179o+cos180o is equal to:

A
0
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
1
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
1
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
D
2
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is B 1
The sumcos1+cos2+.........cos179+cos180is equal to:
=cos1+cos2+.......cos90.......+cos179+(1)
=cos(180179)+cos(180178)+....cos90+....cos178+cos1791
=cos179cos178+......cos90+.....cos178+cos1791
Post cancelling,
=1

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Range of Trigonometric Ratios from 0 to 90
MATHEMATICS
Watch in App
Join BYJU'S Learning Program
CrossIcon