The cosine value of  0  is 1 
*** TEST #1 PASSED ***
The cosine value of  .5  is .877583 
*** TEST #2 PASSED ***
The cosine value of -.5  is .877583 
*** TEST #3 PASSED ***
The cosine value of  1  is .540302 
*** TEST #4 PASSED ***
The cosine value of -1  is .540302 
*** TEST #5 PASSED ***
*** ALL TESTS PASSED ***
