$\sqrt{-121}$
$x^2-2x-8\cdot x-2$
$2w+9-6w=-19$
$\int\frac{sen\left(x\right)}{1-cos\left(x\right)-sen\left(x\right)}dx$
$2\csc\left(2a\right)=\tan\left(a\right)+\cot\left(a\right)$
$64x^6-796$
$\frac{5}{6}a+1-\frac{7}{12}a+1$
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