$xy^'+4y=x^3-x$
$\int\left(sin^5x+2sin^2x+sinx\right)cosdx$
$n-37=-42$
$1+cos2x+2sin^2x=2$
$\frac{8x^4+12x^3+6x^2+x}{3}$
$x+8\le-14-5x$
$\frac{x+1}{9}=\frac{x+3}{3}$
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