Implemented trigonometry functions good

pystencils_tests/test_math_functions.py

@@ -63,4 +63,5 @@ def test_single_arguments(dtype, func, target):
     dh.run_kernel(kernel)
     dh.all_to_cpu()
 
-    np.testing.assert_allclose(dh.gather_array("x")[0, 0], float(func(1.0).evalf()))
+    np.testing.assert_allclose(dh.gather_array("x")[0, 0], float(func(1.0).evalf()),
+                               rtol=10**-3 if dtype == 'float32' else 10**-5)