X^2 - x+0.24 =0
D = 1 - 4*1*0.24 = 1-0.96 = 0.04 =0.2^2
x1 = 1 -0.2 /2 = 0.4
x2 = 1+0.2/2 = 0.6
ОТВЕТ: x1 = 0.4 x2= 0.6
Sin2a = 2sinacosa
sina = - √(1 - 0,36) = - √0.64 = - 0.8
sin2a = 2*0.6*(-0.8) = - 0.96
<em>cos780°=cos(720°+60°)=cos60°=0,5;</em>
<em>sin(13π/6)=sin(2π+π/6)=sin(π/6)=sin30°=0,5.</em>