Объяснение:
[tex]2*cos(\beta -\pi )=2*cos(-(\pi -\beta ))=2*cos(\pi -\beta )=-2cos\beta .[/tex]
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Объяснение:
[tex]2*cos(\beta -\pi )=2*cos(-(\pi -\beta ))=2*cos(\pi -\beta )=-2cos\beta .[/tex]