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7d7a6f9509b713f606a0ad452c864ba756e11a7f: $$
\theta

32d8804e52fa7308d2bf1d9be6dbc2ec3728ae86: $$
\color{cyan} \underline{n_2}

066c521266d61fb8516dee9aaed0c3c793a5b484: $$
\underline{t}(-\underline{e_2})

b4abf881a0d56637cf70be3986932b691561310d: $$
\color{cyan} \underline{n}

05d1b33c8c10b3c80abf537f7c3ec4a53b4af65a: $$
\color{red} S \cdot \cos \theta