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[" If "tan A-tan B=x" and "cot B-cot A=y...

[" If "tan A-tan B=x" and "cot B-cot A=y" ,them "cot],[(A-B)" is "],[[" (a) "(1)/(x-y)," (b) "(1)/(x+y)(c)(1)/(x)+y(d)(1)/(x)-(1)/(y)],[" (e) "(1)/(x)+(1)/(y)," (in "x" ."]]

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