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=sinA/cotA+cosecA*cotA- cosecA/cotA-cosecA
=sinA(cotA-cosecA)/cot²A-cosec²A
=sinA* cotA- sinA.cosecA
=sinA.cosA/sinA-1
=cosA-1
l.h.s
=2+ sinA(cotA+ cosecA)/cot²A-cosec²A
=2+ sinA.cotA+ sinA.cosecA
=2+sinA.cosA/sinA+1
=2+cosA-1
=cosA-1
r.h.s=l.h.s
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