$\sqrt{26.69}$
$a^2-11a+18$
$3x-7+4x+15$
$\left(-\frac{1}{8}x^9-3\:y^8\right)\left(\frac{1}{6}\:x^9\:-\:3\:y^8\right)$
$\left(b-3\right)\left(b+8\right)$
$\frac{8\cos\left(x\right)}{1+\sin\left(x\right)}+\frac{8+8\sin\left(x\right)}{\cos\left(x\right)}$
$2sin^23t-sin3t-1=0$
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