$\left(5x^2-4x-3\right)^2$
$\frac{\left|8-3\right|}{\left|15-7\right|}$
$m^2+4\cdot m^2-4$
$4m^2-36mn+81n^2$
$56,478\:x\:28,45$
$2^{-3}+2^2$
$\cot\left(30\right)\cos\left(30\right)-\sec\left(45\right)\sin\left(45\right)$
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