Mathematical Functions

Problem Statement

Apply mathematical functions to NumPy arrays.

Background

NumPy provides universal functions (ufuncs):

• np.sqrt(): Square root
• np.exp(): Exponential (e^x)
• np.log(): Natural logarithm
• np.abs(): Absolute value

Your Task

Write a function math_functions(arr) that returns a dictionary with:

• "sqrt": Square root of each element (rounded to 2 decimals)
• "square": Square of each element
• "abs": Absolute value of each element

Output Format

Return a dictionary with exactly these three keys. All values as lists.