$\sqrt[3]{1+\frac{x}{3}}-\sqrt[4]{1+\frac{x}{4}}$
$12\left(20-3\right)$
$\frac{\sec^2\left(u\right)-1}{\sec^2\left(u\right)}$
$cos\left(x\right)=-.35$
$-4p\:=\left(-6p\right)$
$\left(9a^4+7b^2\right)\left(81a^2-63ab^2+49b^4\right)$
$\frac{6a^4+5a^3-1}{2a^2+a-1}$
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