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clooudlet09
@clooudlet09
July 2022
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Вычислите cos (a-b), если cos a=3/5,cos b 7/ 25
a и b лежат в 1 четверти
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lsvetik267ls
Verified answer
Cos(a-b)=cosa*cosb+sina*sinb; sina=4\5; sinb=24\25;
cos(a-b)=cosa*cosb+sina*sinb=3\5*7\25+4\5*24\25=21\125+96\125=117\125=0,936
6 votes
Thanks 4
clooudlet09
это совсем другое
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Answers & Comments
Verified answer
Cos(a-b)=cosa*cosb+sina*sinb; sina=4\5; sinb=24\25;cos(a-b)=cosa*cosb+sina*sinb=3\5*7\25+4\5*24\25=21\125+96\125=117\125=0,936