$-5x.\left(2x-5x^2+4\right)$
$\lim_{x\to\pi\frac{\pi}{2}}\left(\sec\left(3x\right)\cos\left(5x\right)\right)$
$\frac{2x}{5}+8=\frac{x}{3}$
$x^2-13x^2+36<0$
$\frac{d}{dx}\:y^3-3y+2ax=0$
$2-3\infty$
$29.78+25.28+12.98+20$
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