$\frac{1}{\sec\:\left(\theta\:\right)-\tan\:\left(\theta\:\right)}-\frac{1}{\sec\:\left(\theta\:\right)-\tan\:\left(\theta\:\right)}$
$5.6=-\log x$
$3x^2-8x+-2x^2-x+3$
$\int\left(4x-10x^2\right)\left(4-20x\right)dx$
$\cos\left(\arccos\left(u\right)\right)$
$x^2-4x-21=0$
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