$49\int x^6sec^4\left(x^7\right)dx$
$-6-9\left(4+3d\right)$
$\int\frac{z^2}{\left(z-4\right)}dx$
$8x+\left(4y-2x+3\right)-\left(5+3y\right)$
$\lim_{x\to2}\left(\frac{x^2-5x}{x^2-x}\right)$
$32\int\tan\left(x\right)^5\sec\left(x\right)dx$
$-2.4x\left(1.1x^2\right)$
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