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Prove that: tan70=tan20+2tan50

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Prove that: tan70=tan20+2tan50

    • Posted by Sachin Sharma 5 years, 7 months ago

    CBSE > Class 11 > Mathematics
    • 1 answers

    Sachin Tiwari 5 years, 7 months ago

    Tan70=tan(50+20) Tan(50+20)=tan50+tan20/1-tan50.tan20 Tan70=tan50+tan20/1-tan50.tan20 Tan70 - tan70.tan50.tan20=Tan50+tan20(by cross multiple) We know tan70.tan20=1 So tan70-tan50=tan50+tan20 tan70=2tan50+tan20

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