$\lim_{x\to0}\left(\frac{3x\cos\left(8x\right)-1}{\sin\left(7x\right)-7x}\right)$
$3z+4+2+4z$
$\int\frac{x^{\left\{2\right\}}-3}{\left(2x^2+1\right)\left(x^2+1\right)}dx$
$-25:-5$
$\frac{dx}{dy}2tx+2t$
$3x^2-5x^2-6x+3$
$-x=-25$
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