$x^2+10x+39=23$
$10x^2+4x+2$
$\lim_{y\to0}\left(\lim_{x\to0}\left(\frac{x-y}{x+y}\right)\right)$
$5x+3\le2$
$-10+1+9x+6+8xz+x$
$4x\left(sec^2x\right)\left(2x\right)$
$\int e^{5x}cos\left(-5x\right)dx$
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