1.\:\:second\:derivative\:test\:4-x^{2}
                                
                             
                                                    
                                
                                    2.\:\:second\:derivative\:test\:x^{2}-2x-3
                                
                             
                                                    
                                
                                    3.\:\:second\:derivative\:test\:x^{3}-3x+1
                                
                             
                                                    
                                
                                    4.\:\:second\:derivative\:test\:x^{2}-6x+8
                                
                             
                                                    
                                
                                    5.\:\:second\:derivative\:test\:x^{3}-3x
                                
                             
                                                    
                                
                                    6.\:\:second\:derivative\:test\:(x+5)^{2}
                                
                             
                                                    
                                
                                    7.\:\:second\:derivative\:test\:\frac{1}{x^{2}}+\frac{1}{x}
                                
                             
                                                    
                                
                                    8.\:\:second\:derivative\:test\:\frac{2x^{2}+6}{x}
                                
                             
                                                    
                                
                                    9.\:\:second\:derivative\:test\:\frac{1}{9+x^{2}}
                                
                             
                                                    
                                
                                    10.\:\:second\:derivative\:test\:\frac{3}{x^{3}-1}