$16^{\frac{4}{4}}+81^{2}-32^{3}$

$\left(3a-2\right)\left(3a+2\right)$

$\lim_{x\to-3}\left(\frac{\sqrt{5+x}}{x}\right)$

$\lim_{x\to64}\left(\frac{\sqrt{t}-8}{x-64}\right)$

$\sin\left(x\right)\left(1-\csc\left(x\right)\right)\left(\sin\left(x\right)+1\right)=-\cos^2\left(x\right)$

$-4x\cdot\left(x-4\right)^2+3\cdot\left(x^2-2x+3\right)-2x\cdot\left(-x^2+5\right)$

$\left(1-\frac{1}{4}x^2\right)^2$