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    				| 1. | 
                                    The general value of ` cos ^(-1)(-1) ` isA. `2 n pi +- (pi)/(2)`B. `2 n pi +- (pi)/(3)`C. `2 n pi +-pi`D. `2 n pi +- (pi )/(6)` | 
                            
| Answer» Correct Answer - C | |