Question

найдите sin( x +pi/6), если sin x = -0.8 и 3pi/2

Answer 1

$xin({3piover2};2pi)Rightarrow cos(x) textgreater 0 \sin(x+{piover6})=sin(x)cos({piover6})+cos(x)sin({piover6})=-0.4sqrt3+{1over2}sqrt{1-0.64}=\=-0.4sqrt3+0.3$