(a^5-2b^3)^3 thanks.
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Step-by-step explanation:
use identity
(a-b)^3=a^3 - b^3 - 3ab(a-b)
a= a^5 b= 2b^3
(a-b)^3=a^15-8b^9-6a^5 ×b^3(a^5-2b^3)
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