$-4x^2-8x+1$
$\frac{91}{\left(x+3\right)}<7$
$-3\cos\:2\theta-18\sin\theta\:-8=-5\sin\theta\:-6$
$2x^2-72x=0$
$\int\left(-1-u^3\right)udx$
$\int\:\frac{sen\:2\:x\:}{3\:+\:cos2x}.dx$
$x2\:\ge\:9$
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