show that b^4-(a^2+b)^4 is divisible by a
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It will have a^2-b^2 as a factor which is further (a+b)*(a-b) both of which have 2 as a factor
Also the other factor a^2+b^2 will also have 2 as a factor because a and b are odd.
So overall given expression is divisible by 8.
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