The arccosine value of  0  is 1.5708                                            
*** TEST #1 PASSED ***                                                          
The arccosine value of  .5  is 1.0472                                           
*** TEST #2 PASSED ***                                                          
The arccosine value of -.5  is 2.0944                                           
*** TEST #3 PASSED ***                                                          
The arccosine value of  1  is 0                                                 
*** TEST #4 PASSED ***                                                          
The arccosine value of -1  is 3.14159                                           
*** TEST #5 PASSED ***                                                          
*** ALL TESTS PASSED ***                                                        
