Question

Вычислите:      $50sin(2arccos(-0,8))$

Answer 1

$50sin(2arccos(-0,8))$

=50*2sin(arccos(-0,8))cos(arccos(-0,8))=100sin(π-arcsin(sqrt(1-(-0,8)^2)))*(-0,8)=-80sin(arcsin(sqrt(0,36)))=-80sin(arcsin(0,6))=-80*0,6=-48