$\left(3x^5-1\right)\left(3x^5+4\right)$
$15x^4-15x^2$
$64\cdot12$
$4^2-4$
$\frac{a}{2}+a_{3\:}$
$\frac{\sec\left(x\right)\csc\left(x\right)}{\cot\left(x\right)}=\sec^2x$
$\int\frac{2x}{\sqrt{4+x^2}}dx$
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