Simplifying
$\left(\frac{3}{4}\sqrt{x}-\frac{2}{5}x^{2+a}\right)^3$
$8\cdot10^6+3\cdot10^6+2\cdot10^3+2\cdot10^2+10+8$
$\int\frac{\cos\left(2x\right)}{e^x}dx$
$2a^2+6-80$
$\frac{4}{1-x^5}$
$-x^2+13x^2-15x^2$
$4k\cdot9k^3$
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