$2x+3\ge1$
$3\sqrt{ab}+\sqrt{4a^3b}-2\sqrt{0,25ab}-a\sqrt{ab}-4\sqrt{\frac{1ab}{4}}$
$6x^2+2x-20$
$2cos^2x\:-1=0$
$1+5\cdot\left(a+1\right)<7\left(a+2\right)$
$x^2-8x+25$
$x-9x+1$
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