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)
= (sqrt((1 - cos(alpha)) / 2) / (1 - cos(alpha))) * (sin(alpha) / cos(alpha)) * z * cos(alpha)
= (sqrt((1 - (-0.8)) / 2) / (1 - (-0.8))) * (sin(-0.8) / cos(-0.8)) * z * cos(-0.8)
= (sqrt(1.8 / 2) / 1.8) * (-0.717 / 0.697) * z * 0.696
= (sqrt(0.9) / 1.8) * (-1.028) * z * 0.696
= 0.33 * (-1.028) * z * 0.696
= -0.226 * z