$\frac{dy}{dx}\:y=x\sqrt{2x+1}$
$-20.20+180$
$6-4-20+4$
$\int sen\left(3x\right)cos\left(2x\right)dx$
$7+\{+3-[+9-\left(+3+2\right)+4]\}-\{-26+[-4-\left(-1-3\right)]+5$
$4x+1>10$
$\lim_{x\to1}\left(\frac{2x+3}{4x^2-5x+1}\right)$
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