# Is that a trig identity?

Geometry Level 3

$\tan{2x} \tan{3x} \tan{5x} = \tan{Ax}-\tan{Bx}-\tan{Cx}$

The above shows a trigonometric identity, where $$A,B,C$$ are positive integers and $$A=B+C$$, enter $$A+B+C$$.

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