$\cot\left(x\right)\left(\csc\left(x\right)-\cot\left(x\right)\right)=\frac{\cos\left(x\right)}{1+\cos\left(x\right)}$
$\frac{dy}{dt}=\frac{ae^{-kt}}{\left(2+e^{-kt}\right)}$
$\left[\left(x-y\right)+7\right]\left[\left(x-y\right)-7\right]$
$\left(x-4\right)-\left(x+3\right)$
$8^2:\:2^2$
$-38-\left(29+60\right)$
$\int-7cos\left(\frac{1}{7}x\right)dx$
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