1.wyrazenie(cos30°-cos45°)(cos30°+cos45°) przyjmuje wartość???
(cos30°-cos45°)(cos30°+cos45°) = cos²30* - cos²45* = (√3/2)² - (√2/2)² = 3/4 - 2/4 = 1/4
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(cos30°-cos45°)(cos30°+cos45°) = cos²30* - cos²45* = (√3/2)² - (√2/2)² = 3/4 - 2/4 = 1/4