$-5x^4-+5x^4-+5x^4+20x^420x^4$
$x^2-4<5$
$\left(6x^3-x^2-75x+100\right)$
$\sin^2\:a=\frac{\cot^2}{\csc^2}$
$\left(a+b^2+c^3+d^4\right)\left(a^2b+c^4+d^5\right)$
$8m+5\ge5$
$\left(5+7y\right)\left(5x+7y\right)$
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