Question

Tan70 = 2 tan50+tan20​

Answer 1

Step-by-step explanation:

tan70 = tan(50+20)

tan70= tan50+tan20/1-tan50.tan20

tan70-tan70.tan50.tan20= tan50+tan20 -eq(1)

tan70=tan(90-20)= cot20= 1/tan20

Substitute tan70 in eq(1)

tan70-tan50= tan50+tan20

tan70=2tan50+tan20

HOPE IT HELPS :)