$\frac{\cos^{2}x-\cos x-\sin^{2}x}{2\sin x\cos x+\sin x}$
$2x^2+4x+2=0$
$\left(\frac{x}{x+y}\right)\le1$
$-9-\left(-45\right)$
$\left(x^2+3y\right)\left(x^2+y\right)$
$6x^2+15x+6$
$-9.98x\:-\:1.08x$
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