$\left(p^2-2r-5\right)\left(p^2+2r+5\right)$

$\cot\left(3x\right)y-10y=0$

$\tan\left(2x\right)=\frac{19}{21}$

$3g^2-9v^4$

$y'=\frac{e^x}{y\left(x\right)^2}$

$\int x^2sin\left(1+x^3\right)dx$

$\lim\:_{x\to\:0}\left(\:\frac{\left(e^{2x}-e^{-2x}-2x\right)}{x\:-\:sen\left(x\right)}\right)\:$