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

[" If "tan A-tan B=x" ind "cot B-cot A=y" then "cot(A-B)=],[[" (a) "(1)/(y)-(1)/(x)," (b) "(1)/(x)-(1)/(y)," (c) "(1)/(x)+(1)/(y)," (d) "x+y]]

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