diff --git a/src/main/py/trigonometry.py b/src/main/py/trigonometry.py
index 282137b..1043118 100644
--- a/src/main/py/trigonometry.py
+++ b/src/main/py/trigonometry.py
@@ -15,6 +15,13 @@ def rad2deg(radNumber):
     return (radNumber * 180) / math.pi
 
 def sin_approx_bhaskara(radNumber):
+
+    shallFlipTheResult = 0
+    if math.pi < radNumber < 2 * math.pi:
+        radNumber -= math.pi
+        shallFlipTheResult = 1
+
+
     num = multiply(16, radNumber)
     num = multiply(num, subract(radNumber, math.pi))
 
@@ -23,4 +30,8 @@ def sin_approx_bhaskara(radNumber):
     denomFrag2 = multiply(denomFrag2, radNumber)
     denomFrag2 = multiply(denomFrag2, 4)
 
-    return divide(num, subract(denomFrag2, denomFrag1))
\ No newline at end of file
+    sinResult = divide(num, subract(denomFrag2, denomFrag1))
+
+    if(shallFlipTheResult == 1):
+        return sinResult * -1
+    return sinResult
\ No newline at end of file
diff --git a/src/test/py/test_trigonometry.py b/src/test/py/test_trigonometry.py
index 8297175..9c1829c 100644
--- a/src/test/py/test_trigonometry.py
+++ b/src/test/py/test_trigonometry.py
@@ -44,6 +44,9 @@ class MyTestCase(unittest.TestCase):
         delta = sin_approx_bhaskara(0.25*math.pi) - 0.707
         self.assertLess(delta, 0.01)
 
+    def test_sin_1point5_pi_should_be_negative_1(self):
+        self.assertEqual(sin_approx_bhaskara(1.5*math.pi), -1)
+
 
 if __name__ == '__main__':
     unittest.main()