jaka wartosc przyjmuje wyrazenie (cos30°-cos45°) (cos30°+cos45°)
prosze o obliczenie to dosc wazne;)
cos30°=√3/2
cos45°=√2/2
(cos30°-cos45°)(cos30°+cos45°)=cos²30°-cos²45°=(√3/2)²-(√2/2)²=3/4-2/4=1/4
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cos30°=√3/2
cos45°=√2/2
(cos30°-cos45°)(cos30°+cos45°)=cos²30°-cos²45°=(√3/2)²-(√2/2)²=3/4-2/4=1/4