$\sec^2a-\tan^2a=1$
$-6-3+5+929-2781$
$\left(x^2-1\right)log_{10}\left(1+x\right)=0$
$x^4-2x^3-3x$
$\int\frac{1}{\sqrt{5x+6}}dx$
$\lim_{x\to-\infty}\left(\frac{3}{7}\right)^x$
$\lim_{x\to0}\left(\frac{e^{5x}-e^{-x}-2x}{sin\left(x\right)}\right)$
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