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    				| 1. | 
                                    If ` sec ^(-1) x ="cosec" ^(-1) y ` . State which of the following is the value of ` ( cos ^(-1) ""(1)/(x)+cos ^(-1) ""(1)/(y ))`?A. `pi`B. `(2pi)/(3)`C. `(5pi)/(6)`D. `(pi)/(2)` | 
                            
| Answer» Correct Answer - D | |