$\lim_{x\to0}\left(1-6x\right)^{\frac{6}{x}}$
$sen4x+sen2x=0$
$\int\frac{\left(7x+3\right)}{x^2+1}dy$
$12b\:+12b$
$\frac{3x^2-5x}{x-6}$
$4xy+8x^2y^3$
$\frac{x^4-16\:}{x+2}$
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