7.1 Integration By Parts/33

$\int (cos{\sqrt {x}})dx$ = $2{\sqrt {x}}\int (cosu)du$ = $2\int {u}(cosu)du$ = Failed to parse (unknown function "\math"): {\displaystyle 2{u}(sinu)-2\int{sinu}du<\math> <math>{u}} = ${\sqrt {x}}$

${du}$ = ${\frac {1}{2{\sqrt {x}}}}dx$

$2{\sqrt {x}}{du}$ = ${dx}$