$\cos\left(2x\right)=\sin\left(x\right)^2+1$
$x^2-\frac{5x}{3}+\frac{25}{36}$
$4x^2+y^2=16$
$\int\left(81+x^2\right)^{-2}dx$
$-6i+15i$
$18ax+8ay+3a$
$\lim_{x\to0}\left(5x\right)^2$
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