$sin\left(\frac{1}{2}x\right)$
$\lim_{x\to\infty}\frac{\sqrt{x^2+4}}{x+4}$
$3y^2=18x^4$
$\sin\left(x\right)-\cos\left(x\right)^2-2$
$\left(4x+3\right)\left(4x-2\right)$
$\int_0^1\left(\left(2x+1\right)e^{-ax}\right)dx$
$\left(x^2+y\right)dx\:+\:\left(y^3+x\right)dy=0$
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