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In electrical engineering, you'll need to find the rates at  which alternating currents and voltages are changing

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In electrical engineering, you'll need to find the rates at  which alternating currents and voltages are changing.  In financial  applications, you may want to calculate the rate at which continuously  compounded interest is growing.  And in healthcare, you might need to  calculate the rate at which per capita costs are rising, where the total  costs and the patient population are both functions of time.  

In short, you'll need to know how to differentiate  trigonometric, exponential, and logarithmic functions, as well as the  products and quotients of functions.  

  Finding an undefined limit by substitution 

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