sukhd503 sukhd503
  • 02-07-2017
  • Mathematics
contestada

Cos 130 cos 40 + sin 130 sin 40

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Аноним Аноним
  • 02-07-2017
cos(a)cos(b) + sin(a)sin(b) = cos(a-b)

cos(130-40) = cos(90) = 0
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