$\int\frac{x}{x\sqrt{25-x}}dx$
$\left(x+4\right)\left(2x-8\right)-2x^2$
$\int14x^{-1}dx$
$4y^2-12y+4$
$\lim_{x\to\frac{\pi}{2}}\left(2\cos\left(5x\right)\sec\left(9x\right)\right)$
$x+\sqrt{x-1}=1$
$x^2+18x+0$
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