Attachment 25325

in the problem in the above picture, how did they get from to ?

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- Oct 21st 2012, 06:37 PMkingsolomonsgravetrig problem involving double angle forumlas
Attachment 25325

in the problem in the above picture, how did they get from to ? - Oct 21st 2012, 06:58 PMchiroRe: trig problem involving double angle forumlas
Hey kingsolomonsgrave.

They are factoring out cos(x) of both sides. Remember that in distributive law if you have ab + ac, then you can factor this out to get a(b+c). - Oct 21st 2012, 07:04 PMkingsolomonsgraveRe: trig problem involving double angle forumlas
OH! of course, thanks!