$\lim_{t\to0}\left(\frac{1}{\frac{sin^2t}{t^2}}\right)$
$cosx\:=\:\frac{4}{5}$
$\frac{4x+2}{x+2}$
$f\left(x\right)=\ln\sec x$
$\log_{\frac{1}{3}}\left(x\right)=-4$
$3y^3-y^2$
$b+169=421$
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