$\left(1+\sin\left(x\right)\right)^2-\frac{2\sin\left(x\right)}{3\tan\left(x\right)}$

$\:3\:-\:\left(\:5\:+\:1\:\right)\:-\:2\:-\:\left(\:6+\:3\:\right)\:-\:2\:-\:\left(\:6\:-\:1\:\right)$

$ax^2-5am^3+am^3x^2-5a$

$\int xsin\left(4x^2+3\right)dx$

$f\left(x\right)=2^2-5$

$\lim_{x\to3}\left(\frac{x^2-625}{x+25}\right)$

$\lim_{x\to\infty}\left(\frac{\cos x}{x-1}\right)$