sin(70°) =
A) sin(50°)cos(20°) − cos(50°)sin(20°)
B) sin(50°)cos(20°) + cos(50°)sin(20°)
C) cos(50°)cos(20°) − sin(50°)sin(20°)
D) cos(50°)cos(20°) + sin(50°)sin(20°)
E) cos(20°)sin(20°) − sin(50°)cos(50°)
sin(α + β) = sin(α) cos(β) + cos(α) sin(β)
it's B correct ?
