Analytical valuation of some non-elementary integrals involving some exponential, hyperbolic and trigonometric elementary functions and derivation of new probability measures generalizing the gamma-type and normal distributions

Abstract

The non-elementary integrals involving elementary exponential, hyperbolic and trigonometric functions, $ \int x^αe^{ηx^β}dx, \int x^α\cosh\left(ηx^β\right)dx, \int x^α\sinh\left(ηx^β\right)dx, \int x^α\cos\left(ηx^β\right)dx$ and $\int x^α\sin\left(ηx^β\right)dx $ where $α, η$ and $β$ are real or complex constants are evaluated in terms of the confluent hypergeometric function $_1F_1$ and the hypergeometric function $_1F_2$. The hyperbolic and Euler identities are used to derive some identities involving exponential, hyperbolic, trigonometric functions and the hypergeometric functions $_1F_1$ and $_1F_2$. Having evaluated, these non-elementary integrals, some new probability measures generalizing the gamma-type and normal distributions are also obtained. The obtained generalized distributions may, for example, allow to perform better statistical tests than those already known (e.g. chi-square ($χ^2$) statistical tests and those based on central limit theorem (CLT)).