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Prove that (cotA- cosA)/(cotA+ cosA) = (...

Prove that `(cotA- cosA)/(cotA+ cosA) = (cosecA -1)/(cosecA+1)`

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`" "L.H.S. = (cotA - cosA)/(cotA + cosA) = ((cosA)/(sinA)- cosA)/((cosA)/(sinA) + cosA)`
`" " = (cosA((1)/(sinA)-1))/(cos A ((1)/(sinA)+1)) = (((1)/(sinA)-1))/((1)/(sinA ) +1)`
`" " = (cosecA -1)/(cosecA +1) = R.H.S`
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