Yahoo Answers: Answers and Comments for How can you rearrange this formula to correctly find cosθ? [Mathematics]
Copyright © Yahoo! Inc. All rights reserved.
https://uk.answers.yahoo.com/question/index?qid=20190825215001AAETZyH
From Robert
enGB
Sun, 25 Aug 2019 21:50:01 +0000
3
Yahoo Answers: Answers and Comments for How can you rearrange this formula to correctly find cosθ? [Mathematics]
292
38
https://uk.answers.yahoo.com/question/index?qid=20190825215001AAETZyH
https://s.yimg.com/zz/combo?images/emaillogouk.png

From Raymond: 1) square both sides
sin^2(T/2) = (1  cos(t))...
https://uk.answers.yahoo.com/question/index?qid=20190825215001AAETZyH
https://uk.answers.yahoo.com/question/index?qid=20190825215001AAETZyH
Sun, 25 Aug 2019 22:02:59 +0000
1) square both sides
sin^2(T/2) = (1  cos(t))/2
2) multiply both sides by 2
2sin^2(t/2) = 1  cos(t)
3) subtract 1 from both sides
2 sin^2(t/2)  1 = cos(t)
4) multiply both sides by 1
1  2sin^2(t/2) = cos(t)
It is the penultimate choice