$\cos\left(\frac{\pi}{2}-x\right)-1$
$9x^4+30x^2+25x$
$\left(x^2+10\right)^5\cdot\left(3x\right)$
$\frac{b^{2\:}-9b-7}{b^2}$
$\frac{d}{dx}\left(\frac{sin^2x+tan^4x}{\left(x^2+2\right)^2}\right)$
$14'6\cdot\frac{9'8}{2}$
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