Let satisfying . Prove that

**Solution**

Since then the numbers

could be sides of a triangle. The area of this triangle is

However , in any triangle is holds that [Weitzenböck]

(1)

where is the area of the triangle. Thus

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# Inequality

Since then the numbers
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Let satisfying . Prove that

**Solution**

could be sides of a triangle. The area of this triangle is

However , in any triangle is holds that [Weitzenböck]

(1)

where is the area of the triangle. Thus