20Recall from calculus that the derivative of the function ex with respect to x is simply ex. That is, the value of an exponential function’s slope is equal to the value of the original exponential function! If the exponent contains any constants multiplied by the independent variable, those constants become multiplying coefficients after differentiation. Thus, the derivative of ekx with respect to x is simply kekx. Likewise, the derivative of ejωt with respect to t is jωejωt.