Jika cosec α=3 dan α terletak di kuadran Iya I,maka cos α =...

csc α = 1/sin α
3 = 1/sin α
sin α = 1/3

sin^2 α + cos^2 α = 1
cos^2 α = 1 - sin^2 α
cos α = √(1 - sin^2 α)
cos α = √( 1 - (1/3)^2)
cos α = √( 1- 1/9) [ 1 itu sama dengan 9/9]
cos α = √(8/9)
cos α = √((2.4)/9)
cos α = (2√2)/3