cos(a)cos(b)
Объяснение:
cos(a+b) + sin(a)sin(b) = cos(a)cos(b) - sin(a)sin(b) +sin(a)sin(b) = cos(a)cos(b)
cos(a)cos(b)
Объяснение:
cos(a+b) + sin(a)sin(b) = cos(a)cos(b) - sin(a)sin(b) +sin(a)sin(b) = cos(a)cos(b)