$\frac{81x^{12}-1}{3x^3+1}$
$6xy-18ax$
$\int-4\cos\left(t\right)-3\sin\left(5\right)dt$
$\lim_{h\to0}\left(\frac{\left(x+h\right)^{\frac{2}{3}}-\left(x\right)^{\frac{2}{3}}}{h}\right)$
$\frac { 8 x ^ { 4 } + 15 x - 24 } { x ^ { 2 } + 3 x + 5 }$
$\frac{4x}{x^2+2x-3}$
$\left(x^2-xy^2+y^2=7\right)$
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