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Let `f: R->[0,oo)` be such that `lim_(x->5) f(x)` exists and `lim_(x->5) ((f(x))^2-9)/sqrt(|x-5|)=0` then `lim_(x->5)f(x)=`A. 1B. 2C. 3D. 0 |
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Answer» Correct Answer - C `lim_(xto5)((f(x))^2-9)/(sqrt(|x-5|))=0` ` rArr lim_(xto5)(f(x))^2-9=0` ` rArr l^2-9=0, "where" lim_(xto5)f(x)=l` `rArr l= +-3` `rArr l=3 [because f(x)ge 0 " for all " x in R ]` `rArr lim_(xto5)f(x)=3` |
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