$\left(20x^4+16x^3+30x^2-10\right)$
$-x\:+\:5d\:+\:7c\:-\:11d\:+\:d\:-\:3c\:$
$y=2\sin\left(\frac{1}{2}x-\frac{\pi}{4}\right)$
$w=z-\sin\left(xy\right),\:x=4t$
$cos\left(a\right)\:\:tga\left(a\right)=\:sen\left(a\right)$
$7-3>0$
$3\sqrt{54x^4}$
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