Question

помогите с математикой. прошу плиз.

Answer 1

$x^2+49=0 \ x^2=-49=49i^2 \ x=pm7i$

$|z_1|= sqrt{(-1)^2+(-1)^2}= sqrt{2} \ |z_2|= sqrt{(1)^2+(- sqrt{3})^2}=2 \ z_1= sqrt{2}(- frac{ sqrt{2}}{2} - frac{ sqrt{2}}{2} i) \ sin alpha=- frac{ sqrt{2}}{2} \ cos alpha =- frac{ sqrt{2}}{2} \ alpha =frac{3pi}{4} \ z_2=2( frac{1}{2} -frac{ sqrt{3}}{2} i) \ sin beta = frac{ 1}{2} \ cos beta =- frac{ sqrt{3}}{2} \ beta = frac{5pi}{6}$