$\lim_{x\to4.001}\left(\frac{x^2-9}{x-3}\right)$
$3x^2+9x+6$
$4x^2-20x-50$
$b^3+ab+a+ab$
$3yxz^2-e^{4z}\sin\left(4x\right)-3x^2=4$
$\int\left(4x^5+\frac{7}{2}x^{-1}-6e^{-x}+4\tan\left(teta\right)-4x^{\frac{3}{2}}+6\right)dx$
$\lim_{x\to\frac{\pi}{2}}\left(5cos\left(-7x\right)sec\left(9x\right)\right)$
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