$-68:-4.-2+9-3.-5+2.8$
$5x+9\ge3x-11$
$\int\left(t^2+1\right)\left(t^3+3t\right)^4dt$
$q^{-3}.q^8.q^8$
$\frac{\left(s+1\right)}{s^2-4s}$
$\frac{1}{cos-jsin}$
$\cos x=\frac{2\tan x}{1+\tan^{2}x}$
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