divide (a*4-16) by (a+2)
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(a^4-16)/(a+2)=((a^2)^2-4^2)/(a+2)=(a^2+2^2)(a^2-2^2)/(a+2)=(a^2+4)(a+2)(a-2)/(a+2)
=(a^2+4)(a-2) Ans
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