$\frac{-1+\tan\left(x\right)^2}{\sec\left(x\right)^2-2}$
$74.77778=\frac{x}{x-2}$
$csc\left(x+\frac{\pi}{2}\right)=-2$
$\left(g^9\right)^7$
$4r+14-r-6$
$3x\left(x\:-\:2\right)\:-\:2y\left(x\:-\:2\right)\:$
$4\cos^2b\:-\:2\sin^2b\:+\:2$
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