$sen\:x\:.\:sen\:\left(2x\right)-2cos^2x=-2$
$-3-\left(-3-6\right)$
$x+10x+25$
$ln\left(\sqrt{\frac{x-56}{x}}\right)$
$1-3-4+4$
$3^{-\infty}+1$
$\frac{\left(+16\right)}{\left(-2\right)}$
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