1/(cos A+sin A-1)+1/(cos A+sin A+1))=sec A+cosecA
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SIN A + SIN A . COS A + TAN A - TAN A . COS A / SIN^2A. 1/SIN A +COS A / SIN A + 1/COS A + SIN A -1/SIN A. COS A / SIN A +1/ COS A .SIN A. COT A + SEC A ...
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