$\frac{4x-5}{7x}<2$
$\left(8x^3-3x^2\right)^2$
$\left(\sqrt{6-x}\:\sqrt{x+4}\right)$
$25x^2+8xy$
$\int\left(\frac{\left(u+1\right)^2}{\left(2u\right)^2}\right)du$
$x^2-16x-16=0$
$\int sen\:9x\:cos2x\:dx$
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