$\frac{tan\:x-\:senx}{tanx}$
$\frac{sin}{cos}=\frac{1}{3}$
$14\cdot78$
$\frac{x^4-x}{x+1}$
$\frac{dy}{dx}=\frac{x.\sqrt{x^2-1}}{y}$
$81z^2-180z+100$
$\int sinx\left(x\right)\cos\left(x\right)dx$
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