x2−25x\frac{\sqrt{x^2}-25}{x}xx2−25
(x−12)(4+x)\left(x-\frac{1}{2}\right)\left(4+x\right)(x−21)(4+x)
26.45⋅10026.45\cdot10026.45⋅100
4cos20−3sin204cos^20-3sin^204cos20−3sin20
−x3x2−9\frac{-x^3}{x^2-9}x2−9−x3
123−321x≥ 122−320x123-321x\ge\:122-320x123−321x≥122−320x
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