$\left(2-3\right)+\left(6-5\right)-8-9\left(4-6\right)-5\left(6-8\right)$

$12x-3y+7x-27-4y$

$\int t^2\:e^t\:dt$

$3x^4-3x^3+6x^2-12x-24$

$\frac{cos\theta\:\left(csc\theta\:+1\right)}{cot^2\theta\:}$

$x\left(10\right)+32y\left(5\right)$

$\int ( 3 x - 20 ) ^ { 10 } d x$