$\frac{3-x}{x+2}+2=\frac{x-1}{x-2}$
$\sin\left(7x-2\right)$
$2^5\cdot3^5\cdot7^5$
$\frac{d^2}{dx^2}\left(\frac{1}{x^2+5}\right)$
$\frac{dy}{dx}+ycotx=cosx$
$8x-3x-4x+x$
$\left(x+4\right)^2^n+2^n$
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