$\left(4-9x\right)0.5$
$\left(21-y\right)^2$
$y\left(\sec x\right)^2dy=\:\left(y^2+1\right)dx$
$8x+y+z+u+-3x-4y-2z+3u$
$\cos\left(2x\right)\cdot\cos\left(x\right)-\sin\left(x\right)\sin\left(2x\right)$
$\left(-6\right)^2+-6$
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