$\frac{\cos\left(x\right)+\cos\left(x\right)\tan\left(x\right)}{1+\tan\left(x\right)}$
$xy'+y=ln\:x$
$3^0-5^1+5^0$
$\int\frac{\left(x-1\right)}{x^2-4x-5}dx$
$x+\frac{y}{2}=7$
$\frac{x^5-x^4}{8gz^2}$
$15d^2-21cd^2+30da-42ca$
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