$\frac{x^4-1}{2+x^2}$
$sin\left(\frac{\pi}{2}-x\right)\left[csc\left(\frac{\pi}{2}-x\right)-sin\left(\frac{\pi}{2}-x\right)\right]$
$\frac{3x}{2}-1<-4$
$\int\frac{\sqrt{\left(36-y^2\right)}}{4}dy$
$\frac{x^3y^7}{xy^3}$
$256sen^8x+sen^2x=1$
$4x-9\le19$
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