$\cot\left(e\right)+\sin\left(e\right)=\cos\left(e\right)$
$x-10=-24$
$\log\left(x-21\right)=\log\left(x\right)+\log\left(8\right)$
$\left(\frac{t}{2}-2n\right)^2$
$10.89-8.1$
$\frac{\sqrt{x-6}\sqrt{x+6}}{x^{2}-36^{2}}$
$\frac{\left(1+x\right)^3\:-1}{x}$
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