Nuair a thugtar an fheidhm logartamach trí:
f ( x ) = log b ( x )
Tugtar díorthach na feidhme logartamach trí:
f ' ( x ) = 1 / ( x ln ( b ))
Is é x argóint na feidhme.
b is é an bonn logarithm.
Is é ln b logarithm nádúrtha b.
Mar shampla nuair:
f ( x ) = log 2 ( x )
f ' ( x ) = 1 / ( x ln (2))
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