$\frac{\csc\left(u\right)}{\frac{1}{\cos\left(u\right)}}=\cot\left(u\right)$
$4x^6a^2-0.01b^4y^{10}$
$4x^2-2x-7;\:x=-2$
$\left[5+4\left(2-7\right)+3\right]+6\left(4+3\right)$
$4x^6+9y^4+12x^3y^2$
$121x^4-\:81y^2\:$
$\int\left(\frac{6x^2-47x-12}{x-8}\right)dx$
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