Assume that a+b = 0
The 0 has a line through it .
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This is a laws of exponents problem. Let's use the identity
4/(a+b)^2 <===this is the most simplified version
NOTE: If you were doing this for a harder problem, this is how you would expand the denominator.
Since there is addition in the denominator, you must factor the denominator.
Therefore the denominator is
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