$\int_0^l\left(\frac{kz}{\left(z^2+x^2\right)^{\frac{3}{2}}}\right)dx$
$\int x^7cos\left(4x\right)dx$
$5a^2-15ab+7ba-21b^2$
$5\left(2f-1\right)+6f$
$\ln\left(x\right)=-4$
$-4\cdot\left(-12+4\right)$
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