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Prove that: tan70=tan20+2tan50 |
Answer» Tan70=tan(50+20)Tan(50+20)=tan50+tan20/1-tan50.tan20Tan70=tan50+tan20/1-tan50.tan20Tan70 - tan70.tan50.tan20=Tan50+tan20(by cross multiple)We know tan70.tan20=1Sotan70-tan50=tan50+tan20tan70=2tan50+tan20 | |