$\frac{a^{12}}{a^7}$
$\lim_{x\to-\infty}\frac{3x+1}{x-\sqrt{4x^2-5}}$
$\left(4a+2b+c\right)^3$
$0,3+0,5$
$\int\tan\left(\frac{x}{2}\right)^2dx$
$\left(-2x-y+5z\right)-\left(5x+6y-7z\right)$
$dy=\left(\frac{1}{1+x^2}\right)dx$
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