Update sum_of_squares.py

BYT-Bender · web-flow · commit 78849a74378f · 2024-10-10T10:28:50.000+05:30
diff --git a/maths/sum_of_squares.py b/maths/sum_of_squares.py
@@ -4,6 +4,8 @@
 The function takes an integer n as input and returns the sum of squares 
 from 1 to n using the formula n(n + 1)(2n + 1) / 6. This formula computes the sum efficiently
 without the need for iteration.
+
+https://www.cuemath.com/algebra/sum-of-squares/
 """
 
 def sum_of_squares(n: int) -> int:
