$\lim_{x\to\infty}\left(\frac{10x+15}{2x^3+7x^2+26x}\right)$

$\int\left(2e^2^x^{+1}\right)dx$

$\frac{dy}{dx}=2x-2y-1$

$81y^2-64z^2$

$\int\frac{1}{4\left(y^2+4\right)}dy$

$\left(3-8\right)+\left(5-3\right)+\left(2-6\right)-\left(3+4\right)-\left(1-7\right)$

$0.69+0.38$