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tan70° = tan20°+2tan50°

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tan70° = tan20°+2tan50°

    • Posted by Vivek Swati Kandari 6 years, 2 months ago

    CBSE > Class 11 > Mathematics
    • 1 answers

    Sam Bhardwaj 6 years, 2 months ago

    Tan70=tan(20+50) Nd using the identity of tan(A+B) Tan70(1-tan20.tan50)=tan20+tan50 Tan70-tan20.tan70.tan50=tan20+tan50 And..tan70.tan20=tan70cot70=1 Now Tan70-tan50=tan20+tan50 Or Tan70=tan20+2tan50

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