jika cotx.cosx-sinx= cosx, maka nilai tan 2x...

TriGonoMetRi

cot x . cos x - sin x = cos x
(cos x /sin x) . cos x - sin² x /sin x = cos x
(cos² x - sin² x)/sin x = cos x

Kdua ruas kalikan sin x

cos 2x = sin x cos x
cos 2x = 1/2 . sin 2x
sin 2x/cos 2x = 2/1
tan 2x = 2 ✔