$\cos^2a\left(\sec^2-1\right)$
$140\::\:\left(-70\right)\:$
$\int x^{-1}ln\left(2x\right)dx$
$3x^2-12x-15$
$x^217x-60$
$-5x+5+9x-1$
$10m-7+10-9m$
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