Would someone mind explaining to me why I got this question wrong? Thank you so much for your help!
2 Answers
Jun 23, 2018
Explanation:
using the half angle identity for cos
∙xcos(θ2)=±√1+cosθ2
given π<θ<3π2 then
π2<θ2<3π4←second quadrant
where cos(θ2)<0
cos(θ2)=−√1−352
×××=−√15
×××=−1√5×√5√5=−√55
Jun 23, 2018
See explanation.
Explanation:
Think about it logically.