$tan\left(\frac{5\pi}{6}-\frac{3\pi}{4}\right)$
$9+-68+17+8+-44$
$6x-8x-4y$
$4\sin2\left(x\right)+2\sin\left(x\right)\cos\left(x\right)=0$
$( 3 x - 2 ) ^ { 2 }$
$cot\left(x\right)-csc^2\left(x\right)cot\left(x\right)$
$\left(2x+y\right)dx-xdy=0$
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