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March 29, 2017

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Can someone please explain (cos(x)+sin(x))/(cos(x)-sin(x)=sec(2x)+tan(2x). I have no luck with this. Thanks

  • Math - ,

    RS
    = 1/cos2x + sin2x/cos2x
    = 1/(cos^2x - sin^2x) + 2sinxcosx/cos^2x - sin^2x)
    = (1 + 2sinxcosx)/[(cosx+sinx)(cosx-sinx)]
    = (sin^2x + 2sinxcosx + cos^2x)/[(cosx+sinx)(cosx-sinx)]
    = (sinx + cosx)^2/[(cosx+sinx)(cosx-sinx)]
    = (sinx + cosx)/(cosx - sinx)
    = LS

  • Math - ,

    Thank you very much!

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