Discussion
Set of elementary functions is closed under
Answer: B
The elementary functions - polynomials, exponentials, logarithms, trigonometric functions and their inverses - are closed under arithmetic operations and composition: adding, subtracting, multiplying, dividing or composing two of them always gives another elementary function.
They are not closed under integration, which is why \( \int e^{-x^{2}}dx \) escapes the class altogether.
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