$-2\sin\left(2x-\pi\right)+4$
$2.\sqrt{8^2+6^2}$
$\frac { 5 } { w } + 0$
$x^2+x-72=0$
$\int3\:x\:e^{-x^2}dx$
$csc^2x-10cscx=-21$
$\log\left(10x^2\right)=\log\left(90\right)$
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