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Chepara
@Chepara
July 2022
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Sin (3П/2 + L) + cos(П-L)
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vikusa2013
Сos(3п/2 + L) + sin(п - L) = sinL + sinL=2sinL
sin5L+sin2L=2sin((5L+2L)/2)cos((5L-2L)/2)=2sin(7L/2)*cos(3L/2)
2sinLcosLcos2L=sin2L*cos2L=1/2 * 2sin2L*cos2L=1/2 * sin4L, что и требовалось доказать
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Answers & Comments
sin5L+sin2L=2sin((5L+2L)/2)cos((5L-2L)/2)=2sin(7L/2)*cos(3L/2)
2sinLcosLcos2L=sin2L*cos2L=1/2 * 2sin2L*cos2L=1/2 * sin4L, что и требовалось доказать