$\lim_{x\to0}\left(x+1\right)^{\sec\left(\frac{\pi}{2}-x\right)}$
$-5x^2+2x^3$
$6x\left(x^2-2\right)^2$
$\frac{2x-3}{x^2-2x-8}$
$\sin^2x=1$
$+9-+4\left(-5\right)$
$\:\:\:\frac{1}{2}\int_0^2tdt$
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