$\csc^2\left(x\right)=7\cot\left(x\right)+9$
$\frac{6r^4}{r}$
$\left(13\sqrt{x}-\sqrt{27b^2}\right)$
$350\:-18,436$
$\frac{1}{sin\left(x\right)}-2$
$\left(cotx-1\right)\left(2sinx+1\right)=0$
$\int\left(5x^2+1\right)\left(5x^3+3x-8\right)^8dx$
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