added test for sin of 0 as well as corresponding functionality

src/main/py/trigonometry.py

@@ -12,4 +12,7 @@ def pi_approx_leibniz(precision):
     return multiply(result, 4)
 
 def rad2deg(radNumber):
-    return (radNumber * 180) / math.pi
+    return (radNumber * 180) / math.pi
+
+def sin_approx_bhaskara(radNumber):
+    return radNumber

src/test/py/test_trigonometry.py

@@ -36,6 +36,9 @@ class MyTestCase(unittest.TestCase):
             delta *= -1
         self.assertLess(delta, 0.01)
 
+    def test_sin_0_should_be_0(self):
+        self.assertEqual(sin_approx_bhaskara(0), 0)
+
 
 if __name__ == '__main__':
     unittest.main()