$-\sin\left(-3x\right)=0$
$\frac{2}{x^3+1}$
$-9-\left(-10+\left(15-25\right)\right)$
$x^2-16\ge1000$
$\left(16x^5\right):\left(4x^2\right)$
$2cos\left(x\right)=-18cos\left(x\right)-10$
$55-\left(-22\right)$
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