$x^2y^2-x^2-1=0$
$\sin\left(x+45\right)+\sin\left(x-45\right)$
$-4x^2+4x+7$
$5xy\frac{dy}{dx}+y=0$
$\lim_{x\to0}\left(\frac{x^3+5x^2+3x}{x}\right)$
$\tan\left(2x\right)=6$
$\lim_{x\to\infty}\left(1+\frac{10}{t}\right)^t$
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