Question

Can anyone help me prove the following trig identity?

tan(50)-tan(40)=2tan(10) it is all in degrees.

Answer 1

write tan(50) as tan(40+10)
use formula tan(a+b)=tana+tanb/1-tanatanb

Answer 2

tan 40+tan10/1-tan 40tan 10 -tan(40)=2tan(10)

Answer 3

I am not getting the right answer for some reason.

Answer 4

\[\cot (2\Pi/9) - \tan (40) = 2 \tan(10)\]

\[\cot (2\Pi/9) = 2 \tan (10) + \tan (40)\]


\[-2 \tan(10) - \tan (40) + \cot (2\pi/9)= 0\]

Answer 5

@homeylova223

is that ur answer