buktikan bahwa sin(x+y)+sin(x-y)/cos(x+y)+cos(x-y)= tan y

TriGonoMetRi

[sin (x + y) + sin (x - y)] / [cos (x + y) + cos (x - y)]
= [2 sin (x + y + x - y)/2 cos (x + y - x + y)/2] / [2 cos (x + y + x - y)/2 cos (x + y - x + y)/2]
= sin x cos y / cos x cos y
= sin x / cos x
= tan x
TAK TerBukTi