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<MATH> a = r . \sin \theta \\ b = r . \cos \theta \\ tan \theta = \frac{ \sin \theta} { \cos \theta } = \frac{ a }{ b } </MATH>
Trigonometry - Tangent
<MATH> a = r . \sin \theta \\ b = r . \cos \theta \\ tan \theta = \frac{ \sin \theta} { \cos \theta } = \frac{ a }{ b } </MATH>