Question

спростити вираз cos57°cos13° + sin57°sin13°​

Answer 1

Ответ:

$cos( alpha - beta ) = cos( alpha ) times cos( beta ) + sin( alpha ) times sin( beta ) \ cos(57) times cos(13) + sin(57) times sin(13) = cos(57 - 13) = cos(44)=0,7193$

Answer 2

спасибо ❤️