Question

tan(a+b)tan(a-b)..Formula ​

Answer 1

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

$\tan(A + B) tan(A - B) = \frac{ \tan \: A + \tan B}{1 - \tan A\tan B} \times \frac{ \tan \: A - \tan B}{1 + \tan A\tan B} \\ = \frac{ {\tan}^{2} A - \ { \tan }^{2} B}{1 - {\tan}^{2} A{\tan}^{2} B}$

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