If , then prove that…

MATHEMATICS · Subjective · CBSE · Mathematics · Introduction to Trigonometry · Introduction to Trigonometry

Problem

If 3tan⁡Atan⁡B=13 \tan A \tan B = 1 , then prove that cos⁡(A−B)cos⁡(A+B)=2\frac{\cos(A-B)}{\cos(A+B)} = 2 .

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