$\cos x+\cos y=1$
$-x+1<3+2x$
$e^{\left(\frac{4}{h}+\frac{9}{x}\right)}$
$3\log\left(2\right)+\log\left(\frac{1}{8}\right)$
$\sin^2\left(x\right)+5\sin\left(x\right)+6=0$
$\int\frac{3}{\left(x+1\right)^2}dx$
$2x-1=x+2$
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