$\frac{tan^2\left(a\right)}{sec^2\left(a\right)}=\:sin^2\left(a\right)$
$x^4+3\:x^3-3x^2-11x-6$
$1-81x^2$
$\frac{x^3-5x^2+17x-13}{x-1}$
$\lim_{x\to0}\left(\frac{\sin\left(2x\right)}{2x}\right)^{\frac{1}{4}}$
$\frac{d}{dx}\left(2y-5x+x^4-x^3y^2=0\right)$
$12x-40>20$
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