\lim \frac { f ^ { 2 } ( x ) - f ^ { 2 } ( x ) } { x - x _ { 0 } }
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0
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lIm(\frac{0}{x-x_{0}})
Combine f^{2}x and -f^{2}x to get 0.
lIm(0)
Zero divided by any non-zero term gives zero.
l\times 0
The imaginary part of 0 is 0.
0
Anything times zero gives zero.
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