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6.
                
                                            Negative exponent of a fraction
                                    
                
                    $\left(\dfrac{a}{b}\right)^{-n} = \left(\dfrac{b}{a}\right)^n$                
                
                11.
                
                    $\int e^{ax} \sin bx dx = \dfrac{a\sin bx - b \cos bx}{a^2+b^2} e^{ax} + C $