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Dyaaa
@Dyaaa
June 2022
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sinx-sin3x/1-cos2x=0
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Bess1996
Если что-то непонятно,то говори
1 votes
Thanks 1
Dyaaa
как из sinx-sin3x получилось -2сos2x*sinx
Bess1996
По формуле
Bess1996
сама формула:sinx-siny=2cos(x+y/2)sin(x-y/2)
Dyaaa
cgfcb,j ,jkmijt
Dyaaa
спасибо большое
Bess1996
поэтому когда мы решаем sinx-sin3x=2cos2xsin(-x)= -2cos2x*sinx
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