$\int2x^4edx$
$\frac{9^{8}-b^{8}}{9+b}$
$x-2>1$
$9x^2-3x-5-5x-9$
$5x^2+13x=6$
$2x+2=2$
$\frac{1-\sin^2}{\sin}\cdot\sec=\cot$
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