4) Вычислите sin(alpha/2) tan(alpha/2) z * cos(alpha/2); 4 если sin alpha = - 0.8 770 deg < 360 deg

sin(alpha/2) tan(alpha/2) z * cos(alpha/2) = sin(alpha/2) * tan(alpha/2) * z * cos(alpha/2) = (sin(alpha)/2) * (sin(alpha)/cos(alpha)) * z * (cos(alpha)/2) = (-0.8/2) * (-0.8/0.6) * z * (0.6/2) = 0.4 * 1.333 * z * 0.3 = 0.4 * z * 0.399 = 0.1596z