$sin\left(2arctan\left(\frac{1}{x}\right)\right)=\frac{2x}{1+x^2}$
$5y<20$
$\int-\left(4x^3-2\right)\left(\cos\left(6x^4-12x\right)\right)dx$
$\frac{22\left(sen45\right)}{sen35}$
$\left(2x\:+\:\frac{1}{2}y\right)^2\:$
$4x-3<10-2x$
$\frac{x^5-8x^3+x+6}{x}$
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