coshine means synonym of hyperbolic cosine.
Etymology
Blend of translingual cosh + cosine.
noun
- Synonym of hyperbolic cosine.“Should a shine or coshine be wanted which is not in the table, advantage may be taken of the differential of cosh x being sinh x, and vice versa. Thus, sinh x and cosh x being known, the shine or coshine of x + y, y being small compared to x, may be calculated from these relationships—[…]”