Trig

prove (cscx-secx/cscx+secx)=(cotx-1/cotx+1)

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  1. cscx-secx/cscx+secx
    = cos/cos * cscx-secx/cscx+secx
    = (cos*csc - 1)/(cos*csc + 1)
    = (cot-1)/(cot+1)

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