$1-w^{11}$
$9\left(1+8s\right)+3s+8$
$9x^2-11x+4$
$\frac{x+y}{x-y}-\frac{x-y}{x+y}$
$72=9y$
$\frac{d}{dx}\sqrt{\frac{x}{x^2+1}}$
$\left(\sec x-\cos x\right).\cot x$
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