( cosecA-sinA ) (secA -cosA)=1/tanA +cotA
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(1+ cotA — cosecA)(1+ tanA + secA)
1 + cotA — cosecA + tanA + cotA tanA — cosecA tanA + secA + cotA secA -cosecA secA
1 +cotA — cosecA + tanA +1- secA + secA+ cosecA — cosecA secA
1 +(cotA + tanA) +1 — cosecA secA
2 + cosecA secA — cosecA secA
2
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