$-7\left(1+8n\right)-6\left(n-8\right)$
$8cos5xsec3x$
$\frac{x-3}{x^3-1}$
$\frac{sin\left(x-b\right)}{cosx\cdot cosb}$
$x^2-4x\:-8y-12=0$
$-y^2-y^2$
$\left(x^2+\left(\frac{b}{2}\right)^2\right)^{\frac{3}{2}}$
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