jika sin x² =4/5 dan 90 < x < 180 , maka tan x² =

Sin^2 x = 4/5

Cos^2 x + sin^2 x = 1
cos^2 x = 1 - 16/25
cos^2 x = - 9/25

Tan^2 x = sin^2 x / cos^2x
= 4/5/ -9/25
= 4/5 x -25/9
= - 20/9
= -2 2/9

Semoga membanu;)