Teaching UP TGT Mock Test Series 2025 Mathematics Trigonometry Multiple and Sub-multiple Angles

यदि tan A – tan B = x और cot B – cot A = y है, तो cot (A – B) का मान क्या है?

1
\(\frac{1}{x} + \frac{1}{y}\)
2
\(\frac{1}{y} - \frac{1}{x}\)
3
\(\frac{{xy}}{{x + y}}\)
4
\(1 + \frac{1}{{xy}}\)
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