$4\sqrt{2}-\sqrt{2}$
$\frac{dy}{dt}=0.5t+y$
$\lim_{x\to0}\left(\frac{\sqrt{1+2x}-\sqrt{1-8x}}{x}\right)$
$\frac{tanx}{secx-1}-\frac{tanx}{secx+1}$
$3ax-3x+4y-4ay$
$\lim_{h\to0}+\left(\frac{\sqrt{h^2+10h+19}-\sqrt{19}}{h}\right)$
$-5x-4x-8y+9y-7x$
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