A) increases in (a, b)
B) decreases-in (a, b)
C) we cannot say that\[\phi \,(x)\]increases or decreases in (a, b)
D) none of these
Correct Answer: C
Solution :
\[\phi '\,(x)=2f\,(x).\]\[f'(x);\] if \[f\,(x)>0\] in (a, b) then \[\phi '\,(x)>0\] and if \[f\,(x)>0\]in (a, b) then \[\phi '\,(x)>0\]\[\Rightarrow \] CYou need to login to perform this action.
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