$169s^2-26s+1$
$2x^2-18x+25$
$\ln\left(x\right)+5=9$
$9x^2-25<0$
$-4\cos\phi-2\sqrt{3}=0$
$2sin\left(\frac{x}{2}\right)cos\left(\frac{x}{2}\right)+1$
$\left(40-2b\right)^2$
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