$\lim_{x\to\frac{1}{2}}\left(\frac{7x-\sin\left(x\right)}{x^2+\sin\left(3x\right)}\right)$
$3\frac{dy}{dx}+12y=0$
$\left(4x+\frac{4}{x^{-3}}\right)$
$3.14\cdot7.5^2$
$8x\:=\:65\:+\:x^2$
$16x^2-24xz$
$4\sqrt{6x^4y^2}$
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