\[x^4-y^4=(x+y)(x-y)(x^2+y^2)\]
\[(x^2)^2-(y^2)^2= (x^2+y^2)(x^2-y^2)\]
= \[(x^2+y^2)(x-y)(x+y)\]
\[3^4-2^4=(3+2)(3-2)(3^2+2^2)=65\]
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