$3\:\cdot\:-3\:\cdot\:4$
$w^2-22w$
$xy^{\prime}=3y+x^{4}\cos x\quady\left(2\pi\right)=0$
$-25.3\cdot12$
$\left(z^3-4\right)^2$
$8+2-\left(-10\right)-\left(+6\right)$
$cos2x-1=0$
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