diff --git a/arithmetic_analysis/newton_raphson.py b/arithmetic_analysis/newton_raphson.py
index 50674be63..27a70bf0c 100644
--- a/arithmetic_analysis/newton_raphson.py
+++ b/arithmetic_analysis/newton_raphson.py
@@ -7,9 +7,7 @@ from __future__ import annotations
 from sympy import diff, symbols, sympify
 
 
-def newton_raphson(
-    func: str, a: float, precision: float = 10**-10
-) -> float:
+def newton_raphson(func: str, a: float, precision: float = 10**-10) -> float:
     """Finds root from the point 'a' onwards by Newton-Raphson method
     >>> newton_raphson("sin(x)", 2)
     3.1415926536808043
@@ -21,9 +19,13 @@ def newton_raphson(
     2.718281828458938
     """
     x = a
-    symbol = symbols('x')
-    exp = sympify(func)  # expressions to be represented symbolically and manipulated algebraically
-    exp_diff = diff(exp, symbol)  # calculates the derivative value at the current x value
+    symbol = symbols("x")
+    exp = sympify(
+        func
+    )  # expressions to be represented symbolically and manipulated algebraically
+    exp_diff = diff(
+        exp, symbol
+    )  # calculates the derivative value at the current x value
     maximum_iterations = 100
 
     for _ in range(maximum_iterations):