$\int\left(x\left(1-x\right)\right)dx$

$615+x^2=2^y$

$\lim_{x\to\infty}\left(\frac{4x^3+2}{x^2+20x}\right)$

$\left(2-1\frac{3}{2}\right)^2$

$\left(-3a^2b+4b-5a\right)-0$

$-y+57=x^2-14x$

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