$\lim_{x\to0}\left(\frac{4\left(sin5x\right)^2}{x^2}\right)$
$\left(4p-5\right)^3$
$\frac{d^2}{dx^2}\left(\frac{x}{y}\right)$
$\int\frac{x+9}{x^2+25}dx$
$\frac{\sqrt{x}+\sqrt{y}}{\sqrt{x}}$
$21x-46x$
$2x^2+x+4x+2$
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