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AidarTN
@AidarTN
July 2022
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Упростите выражение:
Sin 3a/4 * cos a/2 - cos 3a/4 * sin a/2
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revushka1
Это формула синуса разности: sin(a-b)=sina*cosb-cosa*sinb. У нас а=3а/4, b=a/2=2a/4. Тогда a-b=3a/4-2a/4=a/4. Ответ: sina/4
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