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OpenStudy (chillout):
When a - 1/a = 2, then a³ - 2a² - 2/a² - 1/a³ = ?
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OpenStudy (chillout):
Rewriting it, we have a - a^-1 = 2 a³ - 2a² - 2a^-2 - a³. The answer is 2, but how can I prove it?
OpenStudy (chillout):
I meant -a^-3
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