$\csc\left(x\right)=1.21$
$\frac{1}{3x^{-1}}$
$\cos\left(x+y\right)+\tan\left(x\right)+\cos\left(x-y\right)$
$4+4\left(a+x\right)+\left(a+x\right)^2$
$\frac{d^3y}{dx^3}\left(\frac{2}{15}x^6-\frac{2}{9}+\frac{5}{3}x^3\right)$
$\left(-10\right)-\left(-20\right)-\left(+20\right)$
$x^2-20x+51=0$
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