<https://matthew.maennche.com/2017/04/write-definition-function-powerto-receives-two-parameters-first-double-second-int-function-returns-double/>
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<https://matthew.maennche.com/2017/04/write-definition-function-powerto-receives-two-parameters-first-double-second-int-function-returns-double/>
<https://matthew.maennche.com/2017/04/write-definition-function-powerto-receives-two-parameters-first-double-second-int-function-returns-double/>