$4^3\cdot4^{-1}$
$\frac{sin\:x-\:cosx\:}{csc\:x\:-\:senx\:}$
$\ln\left(y\right)=\ln\left(x^{\sec\left(x\right)}\right)$
$-2x-4y-5x+8y$
$\lim_{n\to\infty}\left(\frac{1}{\sqrt{4+n}}\right)$
$2^6+4^4+8^3$
$axb=15$
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