| When taking into account the point group of the cocrystals, the squares of the direction cosines between all C 3 axes and should be identical. |
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| I can remember roughly how to differentiate a standard xy formula but sines, cosines and tangents are a mystery. |
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| If the two angles are the same we get the sines and cosines of double the angle. |
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| I'm working on memorizing the sines, cosines, and tangents of degrees of a circle in terms of pi. |
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| Similar substitutions convert the first law of cosines for trihedrals into the law of cosines for the sides of spherical triangles. |
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| As for the terrifying teacher, can you arrange for an inexpensive tutor, maybe an upperclassman who knows sines, cosines, science or EspaHol? |
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| These formulas are a direct consequence of the law of cosines. |
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| Hence the cosines and versed sines of zenith distances are respectively equal to the sines and coversed sines of the corresponding angular elevations. |
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