added test for approximating pi as well as corresponding functionality using the leibniz-series

src/main/py/trigonometry.py

@@ -1,3 +1,13 @@
 import math
+from src.main.py.logarithmic_and_expo_and_root_calculations import potentiate
+
+def pi_approx_leibniz(precision):
+    result = 0
+    for i in range(precision):
+        num = potentiate(-1, i)
+        denom = 2*i + 1
+        result += num/denom
+    return result * 4
+
 def rad2deg(radNumber):
     return (radNumber * 180) / math.pi

src/test/py/test_trigonometry.py

@@ -9,6 +9,12 @@ class MyTestCase(unittest.TestCase):
     def tearDown(self):
         pass
 
+    def test_pi_precision_1000000_should_be_3_point_141592(self):
+        delta = pi_approx_leibniz(1000000) - 3.141592
+        if delta < 0:
+            delta *= -1
+        self.assertLess(delta, 0.01)
+
     def test_rad_2_to_deg_should_be_114_point_59(self):
         delta = rad2deg(2) - 114.59
         if delta < 0: