$\left(4x+16y\right)$
$\cos^2\left(x\right)-2\cos\left(x\right)-3=0$
$2x^2-x+4x^2-x^2$
$\lim_{x\to0}\left(\sin\left(x\right)^2\right)$
$\frac{1}{x-1}-\frac{2}{x^2}=0$
$\log\left(x-2\right)+log\left(x+6\right)=log\left(8x+33\right)$
$2sen^2\left(x\right)-3cos^2\left(x\right)+1$
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