$\lim_{x\to0}\left(\frac{7x^2}{2ln\left(secx\right)}\right)$

$\left(x^{-2}y^32x^4y^4y^{-2}\right)^2$

$\int\frac{4}{\sqrt{1-4x^2}}dx$

$\left(m^3-3n\right)^3\:$

$\frac{6x^3}{\:3x^6}$

$\lim\:_{x\to\:0}\left(\frac{\sin\:\left(t^2\right)}{t}\right)$

$\sec\left(x\right)=\frac{\csc\left(x\right)+\sec\left(x\right)}{1+\cot\left(x\right)}$