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Анастасия5858
@Анастасия5858
March 2022
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Срочно! Упростите выражение: 2sinasinb+cos(a+b)
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ShirokovP
Verified answer
cos(A+B) = cos A cos B - sin A sin B
cos(A-B) = cos A cos B + sin A sin B
2sinasinb + cosacosb - sinasinb = cosacosb + sinasinb = cos(a - b)
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Answers & Comments
Verified answer
cos(A+B) = cos A cos B - sin A sin Bcos(A-B) = cos A cos B + sin A sin B
2sinasinb + cosacosb - sinasinb = cosacosb + sinasinb = cos(a - b)