$\left(4x-5y\right)+\left(-3x+6y\right)+\left(-x+y\right)$

$x^2-16x+64=30$

$\left(2\sin\left(2x\right)-1\right)\left(\sec\left(x\right)+1\right)=0$

$\frac{2x^2-5x+4}{\left(x-2\right)\left(3x+1\right)^2}$

$\sin\left(x+2\pi\right)=\sin x$

$\int_1^53x-2dx$

$\:-\:6\left[-\:3-\left(-6\:-\:7\:\right)\:+\:5\right]\:-\:8$