MHB Antiderivative Question for ∫a^x dx: Is it a^x/ln a or a^x/ln|a|?

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for ∫a^x dx,

is the answer a^x/ln a or a^x/ln|a| or does it matter?

Thanks
 
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The function $a^x$ is not defined for negative values of $a$. If $a>0$ and $a\not = 1$ then what you wrote is correct without absolute values.
 

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