$1-x<3$
$-5y-4y+y$
$2x^2y+2x^22+2x^22v$
$\sqrt[3]{3x^9-2x^6+x^3}$
$\frac{10\sin^2a-7\cos a+2}{3+2\cos a}$
$123.1\cdot5.6$
$2cos^2x-8=-6$
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