$\left(\frac{e^4.e^7}{e^{-4}}\right)^3$
$4x^5+8x^3+4$
$\left(\frac{1}{8}\right)^{-3}$
$\frac{1+2\cos x}{2}=1$
$0.4a-\frac{2}{5}a$
$-3\left(x+2\right)\left\{9-5\left(8x-1\right)\right\}$
$\left(9x+1\right)\left(9x-1\right)$
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