$x^{10}-4x^{10}+6x^{10}$
$4x+15=r$
$\csc\infty=\sin\infty+\cos\infty\cot\infty$
$\left(x+9\right)\left(x-9\right)x^2$
$\sqrt[4]{3.1416}$
$\int a^udu$
$12a^3-2a$
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