$\left(-2\right).\left(-2\right).\left(-2\right).\left(-2\right).\left(-2\right).\left(-2\right)$
$\int\frac{x-8}{\left(x^2-4\right)}dx$
$\frac{sen2x}{1-cos^2x}\times\:\frac{sen2x}{\cos\:\left(x\right)}$
$n^2-3n-28=0$
$a^2\left(a^2-4a+4\right)-4a\left(a^2-4a+4\right)+4\left(a^2-4a+4\right)$
$1-\left(2-2y\right)^2$
$2x-7=y$
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