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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