1+sinA/cosecA -I-sinA/cosecA+cotA=2(+cotA)
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LHS=
1+sinA/ cosecA/sinA/cosecA+cotA
1+ sinA.sinA/ sinA.sinA+cotA
1+sin²A/sin²A+ cotA
1+1+2cotA
2+ cotA
= RHS
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