$\int\frac{-4+5x}{x^2}dx$
$2u^4-x^2-1=0$
$-\int_{\frac{\pi}{4}}^{\frac{\pi}{2}}\sec xdx$
$-9\cdot15$
$\frac{x^3-2x^2+16x-8}{x+2}$
$a^{\frac{1}{n}}=\sqrt[n]{a}$
$2x^2+8x-7=-2$
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