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1.Relation and Function
normal
વિધેય $f : R \rightarrow R$, $f(x) = \frac{{{{(x\, + \,1)}^4}}}{{{x^4} + \,1}}$ નો વિસ્તારગણ ...... છે
A
[$0 , \infty$]
B
[$0 , 16$]
C
[$0 , 8$]
D
[$0 , 32$]
Solution

Least values of $f(\mathrm{x})$ is obviously $'O'$
$\frac{x^{4}+1}{2} \geq\left(\frac{x+1}{2}\right)^{4} $
$\Rightarrow \frac{(x+1)^{4}}{x^{4}+1} \leq 8$
Standard 12
Mathematics