Compute the sum of (a + (2n + 1)d)^2 - (a + (2n)d)^2 + (a + (2n - 1)d)^2 - (a + (2n - 2)d)^2 + ... + (a + d)^2 - a^2.
Can someone show a step by step solution to this problem? Thanks!
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+4 
