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sockolovaver20
@sockolovaver20
July 2022
1
25
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Помогите, пожалуйста, решить. Желательно с объяснениями.
a) сos75°+cos15°
б) cos п/12 - сos 5п/12
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Answers & Comments
zyryanovakseniya98
А) 2cos45*cos30=2*
=
б) cos(
)-cos(
) = -2sin
(
)*sin (
) = -2*
* -0,5=
2 votes
Thanks 1
sockolovaver20
А можно ещё и под "б"?)
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Answers & Comments
б) cos()-cos() = -2sin( )*sin ( ) = -2* * -0,5=