$\left(6x^{-15}\right)\left(-8x^9\right)$
$cosx=-0,2$
$\frac{1}{36}\left(9x^2-2b^2\right)\left(9x^2+2b^2\right)$
$75x^{-\frac{1}{10}}$
$x^2^x$
$5\cdot x=80$
$m+6m$
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