1.

tan70° = tan20°+2tan50°

Answer» Tan70=tan(20+50)Nd using the identity of tan(A+B)Tan70(1-tan20.tan50)=tan20+tan50Tan70-tan20.tan70.tan50=tan20+tan50And..tan70.tan20=tan70cot70=1NowTan70-tan50=tan20+tan50OrTan70=tan20+2tan50


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