added test for sin of value between zero and negative 2 times pi as well as corresponding functionality

src/main/py/trigonometry.py

@@ -15,18 +15,19 @@ def rad2deg(radNumber):
     return (radNumber * 180) / math.pi
 
 def sin_approx_bhaskara(radNumber):
+    shallFlipTheResult = False  #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(radNumber < 0):
+        radNumber *= -1
+        shallFlipTheResult = not shallFlipTheResult
+
 
     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:
         radNumber = subract(math.pi, radNumber)
-        shallFlipTheResult = 1
-
-    if 0 > radNumber > -2*math.pi:
-        radNumber *= -1
-        shallFlipTheResult = 1
+        shallFlipTheResult = not shallFlipTheResult
 
 
     num = multiply(16, radNumber)

src/test/py/test_trigonometry.py

@@ -53,6 +53,8 @@ class MyTestCase(unittest.TestCase):
     def test_sin_negative_point5_pi_should_be_negative_1(self):
         self.assertEqual(sin_approx_bhaskara(-0.5*math.pi), -1)
 
+    def test_sin_negative_1point5_pi_should_be_1(self):
+        self.assertEqual(sin_approx_bhaskara(-1.5*math.pi), 1)
 
 if __name__ == '__main__':
     unittest.main()