$\int\left(\frac{\left(7x^2\right)}{\left(225+x^2\right)^2}\right)dx$

$12x^5y^3-6xy^4+4x^2y^2$

$\frac{49m^2+14m^2n^1b^3-21mnb^2}{-7m^2n^2b}$

$\lim_{x\to\infty}\left(\frac{x^4-x^2+4}{x^3-5}\right)$

$\int\frac{-2200x}{\sqrt{25-x^2}}dx$

$\csc\left(x\right)+\sec\left(y\right)=2\cdot\sqrt{2}$

$\left(x^5+x^2\right)^2$