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Answer:
⅕a⁶+ b⁴+⅖a³b²
step by step
(⅕a³+b²)
a=⅕a³, b=b²
(a+b)²= a²+b²+2ab
=(⅕a³)²+(b²)²+2×⅕a³×b²
=⅕a⁶+b⁴+⅖a³b²
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