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

$\left(x-y+z-4\right)\left(x-y-z+4\right)$

$4\sin x=2\sin x+1$

$a_{2}-2a_{1}-a_{3}3a$

$158.8121105\sin\left(x\right)-72.26329607=2+\frac{4}{\csc\left(x\right)}$

$-8\left(-15\right)+\left(-9\right)+\left(-3\right)$