| Similar substitutions convert the first law of cosines for trihedrals into the law of cosines for the sides of spherical triangles. |
| If the two angles are the same we get the sines and cosines of double the angle. |
| I can remember roughly how to differentiate a standard xy formula but sines, cosines and tangents are a mystery. |
| I'm working on memorizing the sines, cosines, and tangents of degrees of a circle in terms of pi. |
| Now, gentlemen cosines, will you cease to throw parabolas and hyperbolas at each other's heads? |
| 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. |
