Question

dado sec x=√(2/3), determine cos x

Answer 1

sec x = \/(2/3)
sec = 1/cos
cos = 1/sec
cos = = 1/\/(2/3)
cos = 1/[\/2 / \/3]
cos = \/3 / \/2
cos = \/3.\/2 / 2
cos = \/6/2