diff --git a/src/main/py/trigonometry.py b/src/main/py/trigonometry.py
index 12107e2..4d4d694 100644
--- a/src/main/py/trigonometry.py
+++ b/src/main/py/trigonometry.py
@@ -15,6 +15,8 @@ def rad2deg(radNumber):
     return (radNumber * 180) / math.pi
 
 def sin_approx_bhaskara(radNumber):
+    while(radNumber > 2 * math.pi):
+        radNumber -= 2 * math.pi
 
     shallFlipTheResult = 0  #the bhaskara function can only be used between zero and pi. For the rest of the sin period I simply mirrored the first arch of the curve to match the actual sine wave
     if math.pi < radNumber < 2 * math.pi:
diff --git a/src/test/py/test_trigonometry.py b/src/test/py/test_trigonometry.py
index 9c1829c..4224fd7 100644
--- a/src/test/py/test_trigonometry.py
+++ b/src/test/py/test_trigonometry.py
@@ -47,6 +47,9 @@ class MyTestCase(unittest.TestCase):
     def test_sin_1point5_pi_should_be_negative_1(self):
         self.assertEqual(sin_approx_bhaskara(1.5*math.pi), -1)
 
+    def test_sin_2point5_pi_should_be_1(self):
+        self.assertEqual(sin_approx_bhaskara(2.5*math.pi), 1)
+
 
 if __name__ == '__main__':
     unittest.main()