Diketahui 2cos(x + y)=cos(x- y). Buktikan tan x tan y=1/3

Name: Diketahui 2cos(x + y)=cos(x- y). Buktikan tan x tan y=1/3
Uploaded: 2023-11-25T02:37:00.000Z
Duration: PT3M37.567S
Description: Diketahui 2cos(x + y)=cos(x- y). Buktikan tan x tan y=1/3