$4x^2+20x+4$
$64x^2-16$
$0.65\cdot3.54$
$\left(x+3\right)^2+2\left(2x-1\right)\le2\left(x+1\right)-2$
$\frac{x}{x+b}<x$
$\frac{90}{-a}=5$
$\sin\left(x\right)^4+\cos\left(x\right)^4=1+2\sin\left(x\right)^2\cos\left(x\right)^2$
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