Question

Реши систему уравнений.
{5sinx+2cosy=3
3sinx+5cosy=4

Answer 1

\left \{ {{20sin(x)+12cos(y)=8} \atop {20sin(x)+25cos(y)=15}} \right.

вычитаем:

13cos(y)=7\\cos(y)=\frac{7}{13} \\y=(+-)arccos(\frac{7}{13})+2\pi k

k∈Z

-------\\\left \{ {{25sin(x)+15cos(y)=10} \atop {12sin(x)+15cos(y)=9}} \right.

вычитаем:

13sin(x)=1\\sin(x)=\frac{1}{13}\\x=(-1)^karcsin(\frac{1}{13} )+\pi n

n∈Z