$4.483\cdot10^3$
$\frac{\sin^2a-2cos^2a}{1-3\cos^2a}$
$\left(-\cot\left(x\right)\right)\left(\cos\left(x\right)\right)+\left(\sin\left(x\right)\right)=-\csc\left(x\right)$
$a^2\left(a-6\right)$
$\lim_{x\to-\infty}\left(\sqrt{4x^2+5x+6}-\sqrt{4x^2+x+3}\right)$
$\frac{x^5}{25}\left(5\ln x-1\right)$
$\frac{\cot\left(b\right)^2-1}{\cot\left(b\right)^2}=1$
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