$\frac{d}{dx}\arctan x$
$\lim_{x\to\frac{\pi}{2}}\left(\sec\left(3\cdot x\right)\cdot\tan\left(5\cdot x\right)\right)$
$x^2+2\cdot x\cdot5+5^2$
$\left(1+1\right)^2+\left(1+1\right)^2$
$15x^3y^2-10x^2y^3$
$-3^3+27$
$x=y^6$
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