$3\left(x+2\right)^2-\left(2x-1\right)^2+5x\left(x-8\right)$

$\int sec^2\:\frac{x}{2}\:tan\frac{x}{2}\:dx$

$\left(5x-2y\right)^{3}$

$x+\sqrt[3]{\left(-8\right)}$

$\tan\left(315\right)-x$

$\left(-1\right)-\left(-1\right)-\left(-1\right)+1$

$2\cos\left(x\right)-4\sin\left(x\right)\cos\left(x\right)=0$