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Mathematics, 27.05.2020 18:01 biggy54

In a triangle prove that


\cos( \alpha ) + \cos( \beta ) + \cos( \gamma ) = 4 \times \sin( \frac{ \alpha }{2} ) \times \sin( \frac{ \beta }{2} ) \times \sin( \frac{ \gamma }{2} ) + 1
In a triangle prove that

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In a triangle prove that


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