Question

Tan 70 = 2 tan 50 +tan 20​

Answer 1

Answer:

can u understand clearly?

Step-by-step explanation:

=> 2tan50° = 2tan(70–20)°= 2×tan70°−tan20°÷1+[tan70°×tan20°]

As tan 70° = tan(90–20)°=Cot 20°= 1÷tan20°

=> 2tan50 = 2×tan70°−tan20°÷1+[tan20°×1÷tan20°]=2×tan70°−tan20°÷1+1=tan70°−tan20°

Shifting tan20° to L.H.S.

2tan50°+tan20°=tan70°

hope u understand