$\frac{cos\left(a+b\right)}{cos\left(b\right)}$
$1=x^2$
$4x^5-15x^3\:-40x$
$\left(x+1\right)\sqrt{x^2+1}=y$
$\int\frac{2-x}{6x^2+x-1}dx$
$10x-4\le5-x$
$\left(w^2+7\right)^2$
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