$6\cdot285$
$-4\cdot3^2$
$\int\:4\:sen\:7x\:dx$
$\left(5x+4\right)\left(2x-3\right)$
$\int\frac{1}{x\sqrt{121x^4-25}}dx$
$\left(\frac{3}{4}x+\frac{1}{2}\right)\left(\frac{3}{4}x-\frac{1}{2}\right)$
$\log\left(5\right)x^2-8=0$
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