Question #fb743

1 Answer
Nghi N.
Oct 23, 2015

Solve 2cos 2A + sqrt3 = 0

Ans: #+- (5pi)/12#

Explanation:

#2cos 2A + sqrt3 = 0#
#cos 2A = -sqrt3/2#
Trig unit circle and Trig Table of Special Arcs gives -->
#cos 2A = -sqrt3/2# --> #2A = +- (5pi)/6# --> #A = +- (5pi)/12#

Related questions
Impact of this question
218 views around the world
You can reuse this answer
Creative Commons License