Question: If $\mathrm{A}=\sin ^{2} \mathrm{x}+\cos ^{4} \mathrm{x}$, then for all real $\mathrm{x}:-$
$1 \leq A \leq 2$
$\frac{3}{4} \leq \mathrm{A} \leq \frac{13}{16}$
$\frac{3}{4} \leq A \leq 1$
$\frac{13}{16} \leq \mathrm{A} \leq 1$
Correct Option: , 3
Solution:
