1.\:\:\frac{d}{dx}(x\sin(x)+\cos(x))
                                
                             
                                                    
                                
                                    2.\:\:\frac{d}{dx}(\frac{\tan(x)}{\pi x})
                                
                             
                                                    
                                
                                    3.\:\:\frac{d}{dx}(\frac{\sin(x)+1}{\cos(x)-1})
                                
                             
                                                    
                                
                                    4.\:\:\frac{d}{dx}(\pi\cot(x))
                                
                             
                                                    
                                
                                    5.\:\:\frac{d}{dx}(\tan(x)\sin(x))
                                
                             
                                                    
                                
                                    6.\:\:\frac{d}{dx}(4\sin(x))
                                
                             
                                                    
                                
                                    7.\:\:\frac{d}{dx}(\tan(x)-x)
                                
                             
                                                    
                                
                                    8.\:\:\frac{d}{dx}(\pi\csc(x))
                                
                             
                                                    
                                
                                    9.\:\:\frac{d}{dx}(\frac{\sin(x)}{2x})
                                
                             
                                                    
                                
                                    10.\:\:\frac{d}{dx}(\cos(x)\sin(x))