11)sin(a + b) - sin(a - b)sin(a + b) + sin(a - b)

Ответ:

$sin(\alpha +\beta )-sin(\alpha -\beta )=sin(\alpha )cos(\beta )+sin(\beta )cos(\alpha )-sin(\alpha )cos(\beta )+sin(\beta )cos(\alpha )=2sin(\beta )cos(\alpha )$ $sin(\alpha +\beta )+sin(\alpha -\beta )=sin(\alpha )cos(\beta )+sin(\beta )cos(\alpha )+sin(\alpha )cos(\beta )-sin(\beta )cos(\alpha )=2sin(\alpha )cos(\beta )$

11)sin(a + b) - sin(a - b)sin(a + b) + sin(a - b)​

11)sin(a + b) - sin(a - b)sin(a + b) + sin(a - b)