Given an integer array nums sorted in non-decreasing order, return an array of the squares of each number sorted in non-decreasing order.

Sure, here is a Python solution for your problem:

def sortedSquares(nums):
    # Square each number in the array
    squares = [num ** 2 for num in nums]
    # Sort the array in non-decreasing order
    squares.sort()
    return squares

Here is a step by step explanation:

1. We define a function sortedSquares that takes an array nums as input.
2. Inside the function, we use a list comprehension to create a new array squares where each element is the square of the corresponding element in nums.
3. We then sort the squares array in non-decreasing order using the built-in sort function.
4. Finally, we return the sorted squares array.

You can call this function with your array as the argument to get the desired output. For example:

print(sortedSquares([-4,-1,0,3,10]))  # Output: [0, 1, 9, 16, 100]