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

cos23π5+cos24π5 is equal to?

A
45
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
52
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
54
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
34
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
Open in App
Solution

The correct option is D 34
cos23π5+cos24π5
=cos2(1080)+cos2(1440)
=cos2(900+180)+cos2(1440)
=sin2180+sin2540
sin180=514sin540=5+14
=(514)2+(5+14)2
=3/4

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