$3\sin\left(2x\right)+3\sin\left(x\right)=0$
$-750+125-3+2$
$2x\ge-100$
$\left(\frac{3x}{4}-\frac{1}{2}\right)$
$1,5x^2-0,3y^2-0,2y^2+x^2$
$3x^2-1\le2$
$\lim_{x\to-1}\left(\frac{x^2-2x-3}{x^2+3x+2}\right)$
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