$\left(x+1\right)^2\frac{dy}{dx}-2y\left(x+1\right)=\left(x+1\right)^5$

$-\left(x+3\right)x<18$

$\int\:\frac{7x^2+13x}{x^3+x^2-x-1}dx$

$\lim_{x\to\infty}\left(\left(\ln\left(x\right)\right)-x\right)$

$\frac{\sin^2b}{\cos b}+\cos\left(b\right)=\sec\left(b\right)$

$x^2+50x+100$

$x2\:+\:21x$