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Tan70°=tan20°+2tan50°

Answer» As we all know,tan70°=tan(20+50)°\u200b\u200btan70°=(tan20°+tan50°)/1-tan20°tan50°tan70°-tan20°tan50°tan70°=tan20°+tan50°Also\xa0tan70°tan20°=tan70°cot70°=1Hencetan70°-tan50°=tan20°+tan50°So tan70°=tan20°+2tan50°


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