$\lim_{x\to\pi}\left(\frac{1-\cos\left(2x\right)}{1-senx}\right)$
$\left(x+4\right)\left(x+4\right)\left(x^2\right)$
$1\left(3+2\right)$
$\left(2t-2\right)\left(t+2\right)$
$-7m+3mn$
$\left(\frac{x^2}{9}-\frac{1}{x^2}\right)^4$
$\log\left(10x-4\right)+\log\left(3x-4\right)=2\log\left(5x-2\right)$
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