Tan 70 = 2 tan 50 +tan 20
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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
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