$\cos\left(\frac{2\pi}{5}\right)\cdot\cos\left(\frac{\pi}{5}\right)\cdot40$
$m^2\:x\:x^3\:x^5\:x\:m^6$
$2x^{-3}$
$\left(7x^2+8x\right)\cdot\left(7x^2-8x\right)$
$2x^3\:-x^2\:+3$
$x^2+14x\:+7$
$-\frac{2}{5}x^2+\frac{1}{5}bx^2+\frac{3}{4}bx^2-4bx^2+bx^2$
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