$\lim_{x\to4}2$
$+z-5z$
$\frac{1}{2}a^2-121$
$\sin a\left(\sin a-3\right)=0$
$x^3+\frac{1}{2}x^2+\frac{2}{3}x-\frac{2}{5}+\frac{1}{4}x^3+\frac{1}{2}x^2-x+2+x^3+x^2+x$
$\int\left(x\cdot\sqrt{2\cdot x-1}\right)dx$
$x^2-34x+289$
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