$\sqrt{28.\:7}$
$6sinxcosx=2$
$\left(6x-2g\right)\left(6x-3y\right)$
$\frac{dz}{dy}=8x^2y+4y^3$
$cot\left(a\right)-cot\left(b\right)$
$\left(a^2+1\right)\left(4a-1\right)$
$a+7\cdot3a+2$
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