$cosx=-sin^{\left(2\right)}x-1$
$f\left(x\right)=3x^3-2x^2+x$
$\sec\left(71.6\right)$
$3,\:6^2x^2+3,\:1x$
$9rs7\cdot10rs$
$\left(15x^2+5mn^2\right)^2$
$-12x+6x-4x+5y$
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