$9\left(3y+1\right)+4<10y+2-5y$
$\frac{2\sin x}{\cos x}\cdot\frac{\cos x+1}{\cos x-1}$
$1+tan^2a$
$4x^2b^2-16$
$3x+1=x+1$
$-x^2+10x-8=0$
$-5x^3+4x^2+5x\left(-4\right)$
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