cosA-sinA+1/cosA+sinA-1=cosecA+cotA
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In the 5 step we use the identity a square - b square that is (a+b) (a-b)
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Double coincidence of want mean both the parties agree to sell and buy each commodity I.e what a person is desires to sell is exactly what other
Person wished to buy is known as double coincidence for ex a person want to buy a table in exchange of chair
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