$-1+2+-2+4+-3$
$\frac{\cos x}{1-\sin x}+\frac{\cos x}{1+\sin x}$
$2ab+6ab$
$x^{3\:}+y^3\:=\:7$
$\sec^4\left(x\right)-\tan^4\left(x\right)=2\sec^2\left(x\right)-1$
$a^2-9a+14$
$\sqrt[3]{256c}-\sqrt[3]{54}+\frac{1}{2}\cdot\sqrt[3]{8c}+\frac{1}{3}\cdot\sqrt[3]{128}$
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