a neither
b. odd
e. even

To determine the nature of the function , we can analyze its terms. The term is even, the term is odd, and the term is also odd. Since there are both even and odd terms, the function itself is neither purely odd nor purely even. In general, a function is considered even if for all and odd if . Since doesn’t satisfy either condition consistently, it fits into the “neither” category.

Now, understanding the behavior of odd and even functions can be vital in many real-world applications, especially in physics, where even functions might represent systems with symmetry (like potential energy curves), while odd functions can pertain to rotational dynamics or antisymmetrical properties. Knowing how to classify functions helps streamline problem-solving—making computations with Fourier series or analyzing signals much more straightforward.