$\left(y^2+ty^2\right)y'+t^2-yt^2=0$
$\int\frac{7-98x}{\sqrt{81-49x^2}}dx$
$3+x+y+7$
$\left(4+2x\right)^3$
$\lim_{x\to\pi}\:\left(x-\pi\right)\cos\left(\frac{3\pi}{2}-x\right)$
$7x+10<2x+6$
$\sec\frac{x}{2}\:+2=0$
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