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Let ?(?) = ?? − ??. Find ?′(?) in three different ways, and show that they...

  1. Let ?(?) = ?? − ??. Find ?′(?) in three different ways, and show that they are all equivalent. Specifically: Use the power rule to find ?′(?). Use the definition of the derivative to find ?′(?).Recall?? −?? =(?−?)(?? +??+??). Use the Cauchy-Riemann equations to establish the same result.

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