$\left(-a^7\right)\left(a^{-6}\right)$
$-504-619$
$\lim_{x\to0}\left(\frac{\left(2e^{2x}-2\right)^3}{3e^{x^2}-3x-3}\right)$
$4c-1+3c+8$
$x^2\:=\:5\:-\:x$
$\int_0^{\frac{\pi}{2}}\left(9sin^2xcos^2x\right)dx$
$4x^2-13x+9=0$
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