$\sqrt{4.2}$
$9b^2+30b+25$
$\int\sqrt{121-t^2}dt$
$\frac{dy}{dx}=5x+2y$
$1=x^2+16$
$\lim_{x\to5}\left(\frac{x^2-25}{x^2-125}\right)$
$\left(a^{x+1}-2b^{x-1}\right)\left(2b^{x-1}+a^{x+1}\right)^2$
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