👉 The term "cosh" in mathematics and physics refers to a special function that is used to approximate certain functions, such as those involving exponential growth or decay. It's also known as hyperbolic cosine. The exact value of this function is given by: $$ \cosh(x) = \frac{e^x + e^{-x}}{2} $$ This function has the property that it is its own derivative, meaning that it satisfies the identity: $$ \c