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cotA -cosA/cotA + cosA = cosecA-1/cosecA+1
(cotA -cosA)/(cotA + cosA) = (cosecA-1)/(cosecA+1)
(cotA -cosA)/(cotA + cosA)
((cosA/sinA)-cosA)/((cosA/sinA)-cosA) cotA=cosA/sinA
taking cosA common from numretor nd denominatr nd cancelling it we get
((1/sinA)-1)/((1/sinA)+1) since 1/sinA=cosecA
therfore
(cosecA-1)/(cosecA+1)
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