Question

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

Answer 1

Ответ:

1. 2cos(a)sin(b)

2. 2sin(a)cos(b)

Объяснение:

Answer 2

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 )$