MCQOPTIONS
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				| 1. | 
                                    For transformation from the Cartesian coordinate system toSpherical coordinate system, ap should be equal to ____________. | 
                            
| A. | cos θ | 
| B. | − cos θ | 
| C. | sin θ | 
| D. | − sin θ | 
| Answer» B. − cos θ | |