$\tan\left(x\right)+\left(\frac{\cos\left(x\right)}{1+\sin\left(x\right)}\right)=\frac{1}{\cos\left(x\right)}$
$7\:x\:7$
$141-41-\left(-19\right)$
$2\left(\frac{x+1}{x-1}\right)$
$\frac{d}{dx}\frac{x^2}{x+y}=y^2+1$
$\left(3a-4\right)^3$
$y'=1-x+y^2-xy^2$
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