$\lim_{x\to0}\left(\frac{x^2+1}{x}\right)$
$\int\frac{\left(4\right)}{\sqrt{81+16x^2}}dx$
$2sin2x=tanx$
$8x-3y-9x+5y-2x+y$
$\int_0^25\ln\left(x\right)dx$
$x^3-512$
$2x^2x-3x$
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