$2\cdot sen\left(x\right)-\frac{1}{\left(cos\left(x\right)\right)}=0$
$35x^2y^3-70x^3$
$12a-5a-3a+8a+10a$
$2x^2-200=0$
$\frac{5}{\left(x^2+4\right)\left(x^2-1\right)}$
$\left(\frac{3}{4}m-n^2\right)\left(\frac{3}{4}m+n^2\right)$
$\sqrt{25.1}$
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