$\left(x+4\right)\left(-x+4\right)=16$

$\frac{dy}{dt}=1+y^2$

$\lim_{x\to\infty}\left(\frac{1}{2^x}\right)$

$\lim_{x\to0}\frac{1+\cos\left(\pi x\right)}{x^2-2x+1}$

$\frac{4}{5}x+\frac{3}{4}=\frac{1}{x-1}$

$\left(9t-6\right)^3$

$sin^2\left(x\right)+2cos\left(x\right)+2$