$4-8\cos^2\left(5x\right)$
$x+6=-2$
$4ab-6ac+12ad$
$\left(b^{-7}\right)^2\cdot b^6$
$\left(\sin\left(\pi-x\right)+\sin\left(\frac{\pi}{2}-x\right)\right)\cdot\left(\sin x-\cos x\right)=1-2\cos^2x$
$9 - ( - 2 )$
$\int\frac{3x+1}{x^2+2x+8}dx$
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