UPSC NDA II 2011 Mathematics Paper

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Question : 45 of 120

Marks: +1, -0

If tan‌A−tan‌B=x and cot‌B−cot‌A=y, then what is cot(A−B) equal to?

‌
1
y
−‌
1
x
‌
1
x
−‌
1
y
‌
1
x
+‌
1
y
−‌
1
x
−‌
1
y

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