(6x^4-9e^x)`=(6x^4)`-(9e^x)`=6(x^4)`-9(e^x)`=6*4x^3-9e^x=24x^3-9e^x
(x^3*lnx)`=(x^3)` * lnx+x^3*(lnx)`=2x^2*lnx+x^3*1/x
(6x^4-9e^x)`=(6x^4)`-(9e^x)`=6(x^4)`-9(e^x)`=6*4x^3-9e^x=24x^3-9e^x
(x^3*lnx)`=(x^3)` * lnx+x^3*(lnx)`=2x^2*lnx+x^3*1/x