$\int\frac{1}{x\sqrt{25x^2-36}}dx$
$\frac{\left(-1\right)^k\left(k+6\right)}{k^2+4k+1}$
$\left(-18320\right)-\left(-14300\right)$
$x^2+\left(x+2\right)^2=100$
$\frac{1}{4x}+\frac{9}{5x}$
$\left(x+2a+y\right)^2$
$\frac{d^2}{dx^2}\left(2x+1\right)^3$
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