$7x=49$
$x^2-9<0$
$\frac{1}{4}+4.6$
$\lim_{x\to11}\left(\frac{x^2-121}{77-4x-x^2}\right)$
$\int4^{3x}dx$
$\frac{d}{dx}\left(\frac{x^2\sin\left(2x\right)+xcos\left(2x\right)+5xsen\left(2x\right)}{2}\right)$
$\left(\frac{1}{2}x+2y\right)^4$
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