Помогите решить системы:

1) x+y=пи

cosx-cosy=1

2) x+y=пи

sinx+siny=1

y=pi-x

cos x - cos (pi-x) = 1

cos x + cos x = 1

cos x = 1/2

x1 = pi/3+2pik, k in Integers or x2 = - pi/3+2pin, n in Integers

y1=2pi/3 - 2pi k

y2=4pi/3-2 pi n

y=pi-x

sinx + sin (pi-x) = 1

sin x + sin x = 1

sin x = 1/2

x1=pi/6 + 2*pi*n, n in Integers or x2=5pi/6 + 2*pi*k, k in Integers

y1=5pi/6-2pin

y2=pi/6-2pik