trig..

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ctgx+cosx=1+ctgx*cosx

  • trig.. -

    LS = cotx + cosx
    = cosx/sinx + cosx
    = (cosx + cos^2x)/sinx

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

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