Question

tan 70°= 2tan50°+ tan20°​

Answer 1

Answer:

Step-by-step explanation:

As we all know,

According to the trigonometric identity,

tan70=tan(20+50)

tan70=(tan20+tan50)/1-tan20tan50

tan70-tan20tan50tan70=tan20+tan50

Also tan70tan20=tan70cot70=1

Hence

tan70-tan50=tan20+tan50

So tan70=tan20+2tan50

Hope this helps :) :)