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Cos[2tan inverse (1/7)]=

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Cos[2tan inverse (1/7)]=

    • Posted by Anil Gurjar 7 years, 11 months ago

    CBSE > Class 12 > Mathematics
    • 2 answers

    Sahil Satyam 7 years, 11 months ago

    =cos{ cos inverse{[1-(1/49)]/[1+(1/49)] } =(48/49)/(50/49) =48/50 =24/25

    1Thank You

    Usha Bisht 7 years, 11 months ago

    First break 2 tan inverse formula in term of cos . i.e. Cos inverse (1-x ka square /1+x ka square) then u will get your answer

    1Thank You

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