all formulas of 11 trigo
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\sin (A+B) = \sin A \cos B + \cos A \sin B.
\sin (A -B) = \sin A \cos B – \cos A \sin B.
\cos (A + B) = \cos A \cos B – \sin A \sin B.
\cos (A – B) = \cos A \cos B + \sin A \sin B.
\tan (A + B) = \frac{\tan A + \tan B}{1 – \tan A \tan B}
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