$x+3y\cdot3x^2y^2$
$f\left(x\right)=3x^4-65x^3$
$33st-st+14-7st-18st$
$x^2+4<0$
$250+8+2$
$\frac{1-\cot\left(x\right)}{\cot\left(x\right)}=\tan\left(x\right)-1$
$x2+3x-18=0$
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