$k^9\:k^5$
$2\cdot4-8-8\cdot2$
$\frac{d^n}{dx^n}\left(cos3x\right)$
$8x^6-10x^5+5x^3$
$4y-5y$
$9x^2+18x+17$
$\frac{\sin\left(x\right)}{1+\cos\left(x\right)}+\frac{1}{\sin\left(x\right)}+\frac{1}{\sin\left(x\right)}\cos\left(x\right)$
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