$\lim_{x\to10}\left(\frac{sin6x}{7x}\right)$
$\left(2x^2-4x\right)^3$
$\ln\left(x\right)+\frac{dy}{dx}\sin\left(y\right)=0$
$\frac{6x^2y^{-3}}{2x^{-4}y^{-5}}$
$3xy^2-3xy^2+11y^2x$
$8^2-2\cdot4$
$81x^2+198x+121=0$
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