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24ИскрА24
@24ИскрА24
June 2022
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Помогите решить, очень нужно, спасибо...
1)Sin8α + sin5 α
2) cos2 x- cos3 x
3) sin3α - sin9α
4) cos13 x + cos 12 x
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47lika74
Sin8α+sin5α=2* Sin((8α+5α)/2) *cos ((8α-5α)/2 )=2*sin (13α/2) *cos (3α/2)
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