$\left(1-\cos^{2}x\right)\sec x=\sin x\tan x$
$-3x+\left\{5w-\left[5z-3x-\left(-5w+4z\right)\right]\right\}+z$
$\int\left(x^2\left(x^3-2\right)^2\right)dx$
$\frac{2x^3-x^4-12}{x+3}$
$y=-\frac{2x+9}{2}$
$\:\frac{\left(x-1\right)^{2n}}{9^n\left(3n+1\right)}$
$\left(2x+7\right)^3+31=4$
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