$\frac{cos^2x+1}{sin^2x}+1$
$x-5<2x-6$
$36a^2+24ab+16b^2$
$\frac{6^5\:x\:35^3}{81\:x\:25}$
$12x^2-20x+40$
$\left(5x^{n+1}-2\right)^3$
$\frac{b}{6}+4\le3$
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