Asked by Esse Adem

Find the of the six trigonometric function of x if cos 2x =4÷5
Answered by oobleck
cos2x = 4/5

sinx = √((1-cos2x)/2) = √(1/10)
cosx = √((1+cos2x)/2) = √(9/10)
tanx = sinx/cosx = 1/3
and so on