Ответ:
cos(a + B) - 2sin a* sin B= cos a* cos B - sin a*sin B - 2sin a* sin B= cos a* cos B -3sin a sin B
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Ответ:
cos(a + B) - 2sin a* sin B= cos a* cos B - sin a*sin B - 2sin a* sin B= cos a* cos B -3sin a sin B