cos(a-b)-cos(a+b)
a-альфа
в-бетта
сократите
cos(a-b)=cosacosb+sinasinb, cos(a+b)=cosacosb-sinasinb.
cosacosb+sinasinb-cosacosb+sinasinb= 2sinasinb
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Answers & Comments
cos(a-b)=cosacosb+sinasinb, cos(a+b)=cosacosb-sinasinb.
cosacosb+sinasinb-cosacosb+sinasinb= 2sinasinb