$8\tan\left(z\right)+3\cos\left(z\right)=0$
$\left(2x+3y-4\right)-\left(x-4y+1\right)$
$\sec\left(x\right)-\frac{\tan\left(x\right)}{\csc\left(x\right)}$
$\lim_{x\to\infty}\left(\frac{3e^x-\frac{2}{e^x}}{2e^x+\frac{3}{e^x}}\right)$
$z=e^{x^2+y^2}$
$x^{3}-x^{2}+5x-2x^{2}+10x-13x^{3}$
$\lim_{x\to\infty}\left(-\log\left(x+2\right)+\log\left(x-2\right)\right)$
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