Question 651799
ln(z^4-z^2) 
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Factor:
= ln(z^2(z^2-1))
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= ln[z^2(z-1)(z+1)]
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= ln(z^2) + ln(z-1) + ln(z+1)
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= 2ln(z) + ln(z-1) + ln(z+1)
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Cheers,
Stan H.
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