$\lim_{n\to\infty}\left(\frac{3^{n-1}}{3^{n-1}+1}\right)$
$\sqrt{10^{-5}}\:\:.\:0,2$
$\left(4x^2-6x\right)+\left(-7x^2+10x\right)$
$\int c^3\arctan\left(c\right)dc$
$-11k=22$
$\int e^{\left(-st\right)}\cdot e^{\left(2t\right)}$
$\left(\tan y+\cot\left(y\right)\right)\:\sin\left(y\right)\cos\left(y\right)$
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