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    				| 1. | 
                                    `Cos^(-1) ( 4x ^(3) - 3x ) =a + b cos ^(-1)x ` is a equation of trigonomatric inverse circular function . If ` x in [-(1)/(2),-1]` then the value of ` a +bpi ` is -A. `2pi `B. `3pi`C. `pi`D. `-2pi` | 
                            
| Answer» Correct Answer - C | |