$\left(x-6y\right)\left(3x-2y\right)$

$\left(wa+bx2\right)\left(wa-bx2\right)$

$\frac{\cos\left(x\right)}{1}+\frac{\cos\left(x\right)}{\sin\left(x\right)}$

$\left(3m^2-10\right)\left(3m^2+10\right)$

$\left(t^2-2\right)\left(t^2+5\right)$

$\left(8x^2-3\right)\left(6x^2+5\right)$

$-\left\{50+\left[-70+\left(-10+30+40\right)-20\right]-8\right\}$