$\frac{7^5-k^5}{7+k}$
$9x^2-63x+49$
$\:4\:cos\:x\:sec\:y$
$\left(5x^3+6m^4\:\right)^2$
$6x^2\left(9x-4\right)-7y\left(4-9x\right)$
$\sqrt[5]{64m^4n^{12}}$
$\lim_{x\to0}\left(\frac{\left(7sin\left(4x\right)ln\left(4x\right)\right)}{1}\right)$
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