Ответы на вопрос:
Cos п/5*cos п/8=1/2сos(π/5-π/8)+1/2cos(π/5+π/8)= =1/2cos3π/40+1/2cos13π/4 sin п/10*cos п/8=1/2sin(π/5-π/8)+1/2sin(π/5+π/8)= =1/2sin3π/40+1/2sin13π/4
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