( x^-4 + y ^-4 )^-1
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Step-by-step explanation:
( x^-4 + y ^-4 )^-1=1/(1/x⁴+1/y⁴)
=1/(y⁴+x⁴)/x⁴y⁴
=x⁴y⁴/x⁴+y⁴
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