$5f^6+3f^6-2$
$\left(9c-6b\right)^2$
$x^2+36x+18$
$y^{'''}-4y^{''}-5y^'=0$
$\int\cos^{2}4x\sen4xdx$
$3\cos\left(x\right)-\cos\left(2x\right)=2$
$7-3x\le-2$
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