Úloha ID 709 - 
Řešením rovnice 3 − 3sin x = 2cos2 x je číslo?
Správná odpověď je: B
Prostě vyzkoušet každou hodnotu. D a E lze vidět hned, že neplatí (vždy jedna honota je 1 nebo -1 a druhá nula - nikdy se nebude rovnat).
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