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TRIG

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Verify
cos x/1+sinx + 1+ sinx/cosx = 2sec

  • TRIG - ,

    in this case you must use brackets or else the statement is false

    LS = cosx/(1+sinx) + (1+sinx)/cosx
    = cosx/(1+sinx) + (1+sinx)/cosx
    = ( cosx(cosx) + (1+sinx)(1+sinx) )/(cosx(1+sinx))
    = (cos^2 x + 1 + 2sinx + sin^2 x)/(cosx(1+sinx))
    = (1 + 1 + 2sinx)/(cosx(1+sinx))
    = 2(1+sinx)/(cosx(1+sinx))
    = 2/cosx
    = 2secx
    = RS

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