$\frac{d}{dx}-4x+5=0$
$12x^3y^3\:-\:9x^2y^4\:+\:6xy^5$
$.50\:+\:.50y$
$-8-4-3+2$
$\frac{\sec^2a-1}{\sec^2a}$
$cos\:x\:sec\:x-\frac{sec\:x}{cos\:x\:}$
$\frac{n^{3}-8}{n^{3}+3n-10}$
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