[" 21.Let "f:(0,oo)rarr R" and "f(x)=int_(0)^(x)f(t)dt],[" If "F(x^(2))=x^(2)(1+x)" then "f(4)" equals "]

Let f:(0,oo)to R and F(x)=int_(0)^(x) f(t)dt. " If " F(x^(2))=x^(2)(1+x) , then f(4) equals

Let f:(0,oo)to R and F(x)=int_(0)^(x) f(t)dt. " If " F(x^(2))=x^(2)(1+x) , then f(4) equals

Let f:(0,oo)to R and F(x)=int_(0)^(x) f(t)dt. " If " F(x^(2))=x^(2)(1+x) , then f(4) equals

Let f:(0, oo) in R and F(x) = int_(0)^(x) f(t) dt . If F(x^(2))=x^(2)(1+x) then f (4) equals

Let f:(0, oo) rarr R and F(x^(2))=int_(0)^(x^(2))f(t)dt. " If "F(x^(2))=x^(2)(1+x) , then f(4) is equal to ________________

f:(0,oo)->R and F(x)=int_(0)^(x)f(t)dtIfF(x^(2))=x^(2)(1+x),thenf(4)

Let f : (0,oo) to R and F(x)=int_(0)^(x)t f(t)dt . If F(x^(2))=x^(4)+x^(5) , then

Let f : (0,oo) to R and F(x)=int_(0)^(x)t f(t)dt . If F(x^(2))=x^(4)+x^(5) , then

Let f:(0,oo)rarr R and F(x^(3))=int_(0)^(x^(2))f(t)dt If F(x^(3))=x^(3)(x^(2)+x+1), then f(27)=