$5xy-1=0$
$2,4<0,3+\frac{7}{10}\:k$
$x^4+45x^2+16x^2$
$\sec\left(x\right)=\frac{1}{\sqrt{3}}\:$
$\log_{3x}\left(243\right)=5$
$\left(xy-xz\right)^2$
$\int_0^{2a}\left(e^{-xy}\right)dx$
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