$\int_{\frac{1}{6}}^{\frac{1}{2}}\left(\csc\left(\pi t\right)\cot\left(\pi t\right)\right)dt$

$-5\left(-1\right)^7-8\left(3\right)^2$

$+1-\left|+3-\left(-8\right)\cdot\left(+8\right)\right|+\left|+6+\frac{\left(+8\right)}{\left(+4\right)}\right|$

$8xe^3x$

$4i^2-5i-2$

$\sqrt{x+4}=4$

$12\cdot67$