$dy=\frac{\left(cos^2x-sen^2x\:\right)}{\left(2\:sen\:x\:cos\:x\right)}dx$
$\lim_{x\to0}\left(\frac{e^{-x^2}}{x^2}\right)$
$\left(-30\right)-311-\left(-418\right)$
$\frac{-100}{100}$
$\frac{dy}{dx}=0.005\cdot x\left(1-\frac{x}{200}\right)$
$\ln\:\sqrt{x-6}=4$
$\left(a^x^{+1}-26^{x-1}\right)\left(26^{x-1}+a^{x-1}\right)$
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