Let $f$ be the function with derivative given by $f^{\text{'}}(x)=sinxcos(2x)-\frac{}{4}$ for $0x.$ On which of the following intervals is $f$ increasing?

$0,0\mathrm{.}724$ and $2\mathrm{.}418,3\mathrm{.}142$

$0,0\mathrm{.}253$ and $1\mathrm{.}571,2\mathrm{.}889$