The Addition Formulas

The following formulas are of the most essential trigonometric formulas that will be utilized in the subsequent text, their proof is attached by the end of this section:



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...\cdot\sin{\alpha}
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[colback=black!10!white, colframe=b...
...phi}\cdot\sin{\alpha}
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...cdot\tan{\phi}
}
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...pi)} \\
= - \cos(\phi)
\)
\end{proof}
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