$\left(0.5b+4d\right)^2$
$\frac{du}{dt}=\frac{t^4+3u}{t}$
$8y^2-18$
$\frac{d}{dx}x^2+4y$
$x^3+x^2-12x$
$\frac{1+\cos\left(2x\right)}{2\cos\left(x\right)}=\cos\left(x\right)$
$-12sen\left(3x\right)sen\left(x\right)$
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