$\lim_{x\to0}\left(x\:cotx\right)$
$\lim_{x\to\infty}\left(x^3+3^{\frac{1}{\ln\left(x\right)}}\right)$
$\left(\frac{2}{3}d+\frac{5}{4}a\right)^4$
$5y+4-6+2y$
$\left(2x-7\right)^2=\left(3x-1\right)^2$
$\log_{\frac{1}{2}}\left(\left(2x\right)^{-1}\left(x+2\right)^{-1}\right)=\log_{\frac{1}{2}}\left(\frac{1}{16}\right)$
$t\left(t\right)=3-\frac{1}{2}\sin\left(2t-\pi\right)$
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