$\frac{1}{\csc y-\cot y}=\csc y+\cot y$
$\left(x+8\right)\left(x-3\right)<0$
$-4x>12$
$\frac{cos\left(3x\right)-sin\left(3x\right)}{1-2sin\left(2x\right)}=cos\left(x\right)+sin\left(x\right)$
$\lim_{x\to0}\left(\frac{4\sin\left(x\right)}{x^3}\right)$
$\int2e^{2t+6}dt$
$\left(-33\right)\::\:\left(-3\right)\:.\:\left(-2\right)$
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