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Prove that tan50=tan40+2tan10

Answer» Nice ??
tan50=tan(40+10)Now,tan(40+10) =(tan40+tan10)/1-tan40tan10tan50-tan50tan40tan10 = tan 40 + tan10(*tan40=cot50)tan50-tan10=tan40+tan10tan50 = tan40+2tan10 hence proved


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