$1+x<7x+4$
$\int\left(\frac{x^3}{9-x^2}\right)dx$
$5sinx+2cos^2\left(x\right)-4$
$3.2-87.23$
$22+2+3-4-5-6-7$
$\lim_{n\to\infty}\left(\frac{2n}{n^2+1}\right)$
$\frac{dy}{dx}\tan\left(2y\right)=x+\sec\left(x\right)$
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