$\lim_{x\to0}\left(\frac{\left(\left(-19\right)^x\cdot x^2\right)}{x+21}\right)$
$\left(\frac{y}{2}-\frac{x}{3}\right)^3$
$y^2=\sqrt{-x^2+1}$
$\left(4x^3-y^2\right)\left(4x^3-y^2\right)$
$\int_0^5-e^{-x}dx$
$\frac{\sin\left(x\right)}{\cos^2\left(x\right)\cos\left(x\right)}$
$x^2+y^2-1=0$
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