$\lim_{x\to a}\left(\frac{1-cosx^2}{x^2senx^2}\right)$
$3\log\:c-y\:\log\:d$
$8\left(3+2\right)-12$
$5x^2+20x-6$
$\int\frac{x^2}{\left(1-2x^3\right)}dx$
$x^2+7x+7=66-x$
$\int\frac{2x-1}{\left(4x^2+x\right)}dx$
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