$y'+y^2=y$
$1+\frac{2\cos x\left(1+\cos x\right)}{\sin^2x}=\frac{1+\cos x}{1-\cos x}$
$2x^2+5x-3$
$y=-2x^2-3x+1$
$5x^2-15x+36=x^2-12x+10$
$\left(n^4+3\right)^2$
$-107-78-74$
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