$11x\cdot4x^4$

$\frac{\left(1+sin^2x\right)}{\left(1+cos^2x\right)}$

$-\frac{32}{81}\left[\left(\frac{\sqrt{4-9\left(\frac{2}{3}\right)^2}}{\frac{2}{3}}\right)^3-\left(\frac{\sqrt{4-9\left(\frac{2}{3}\right)^2}}{\frac{2}{5}}\right)^5\right]$

$8+x<-2$

$500\frac{dx}{dt}=5-50x$

$\lim_{x\to1}\left(\frac{3x-3^x}{2x-2^x}\right)$

$\int e^{2t}dt$