$\lim_{x\to\infty}\left(\sqrt{x-\sqrt{x}}-\sqrt{x+\sqrt{x}}\right)$
$\left(3\cdot3000\right)+\left(5\cdot3\cdot0.01\right)$
$3x\:+\:5\:+4x\:=19$
$-15-\left(-12\right)+7-8$
$\lim_{x\to\pi}\left(\frac{\text{sen}\left(\pi-x\right)}{\pi-x}\right)$
$\int tan\left(9x\right)^4dx$
$4x^2-9\:=0$
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