$\frac{3-x\left(x+2\right)}{54}$
$2^{x^3}^{-3^{x^2}}$
$-47.90-86$
$-4x^2+19x-21=-7x^2+34x-33$
$\frac{\left(tan^2x\right)}{tan^2x+1}$
$\lim_{x\to0}\left(\frac{6x+6sinx}{5x+5cosx}\right)$
$\int2^xsin\left(2x\right)dx$
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