A) 1
B) 2
C) 3
D) -1
Correct Answer: D
Solution :
We have,
From above, we have \[f'\left( x \right)=\frac{x}{2}-\frac{3}{2},\,x<1\] \[\therefore \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,f'\left( -1 \right)=\frac{-1}{2}-\frac{3}{2}=-2\]
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