trigonometry

Question: If $\cos (A-B)=\frac{3}{5}$ and $\tan A\tan B=2,$ then

1) $\cos A\cos B=\frac{1}{5}$

2) $\sin A\sin B=-\frac{2}{5}$

3) $\cos A\cos B=-\frac{1}{5}$

4) $\sin A\sin B=-\frac{1}{5}$

Solution:

Explanation: No Solution

Trigonometric ratios of sum and difference of two and three

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