Question:`a^2 + b^2` = কত?
A `((a + b)^2 + (a - b))^2/2` B `((a + b)/2)^2 - ((a - b)/2)^2` C `((a + b)^2 - (a - b))/2` D `((a + b)/2)^2 - ((a - b)/2)`
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