$2\tan\left(x\right)=1$
$-18:-6$
$\frac{6x^5+x^4+4x^2+1}{2x^2+x-3}$
$3x^2+6x-144$
$-\sin\left(a\right)-\sin\left(b\right)$
$-2x^2+8x+3$
$3x^{2}-21x+30\geq0$
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