$\frac{dy}{dt}=8e^{\left(-\frac{t}{3+y}\right)}\:;y\left(0\right)=0$

$\lim_{b\to2}\left(\frac{3b}{\sqrt{3b+3}-1}\right)$

$y'\:=\:-4y$

$\lim_{x\to\infty}\left(\frac{4-x^2}{x^2-9}\right)$

$\left(x^3+2^2-x+4\right)$

$1a\:+\:1a$

$3x^4+6x^3-10x^2-x+6$