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$f\left(x\right)=\frac{x^4sin^2\left(x\right)cos^2\left(x\right)}{\left(e^x+1\right)^3}$
$6m+14-11+3m$
$11r-5r+6r=84$
$1-x<3$
$\lim_{x\to\infty}\left(\frac{1}{x}-3\right)$
$3tanx+3=0$
$-x+3\:=\:-\left(x-3\right)$
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