The teacher will be very surprised to see your correct solution 😉
/x - pi\ cot|------| - 1 = 0 \ 4 /
sum
-2*pi
=
-2*pi
product
-2*pi
=
-2*pi
-2*pi
x1 = 56.5486677646163
x2 = -43.9822971502571
x3 = 81.6814089933346
x4 = -94.2477796076938
x5 = 18.8495559215388
x6 = 31.4159265358979
x7 = 94.2477796076938
x8 = -106.814150222053
x9 = -18.8495559215388
x10 = -6.28318530717959
x11 = -31.4159265358979
x12 = 69.1150383789755
x13 = -81.6814089933346
x14 = 6.28318530717959
x15 = 43.9822971502571
x16 = -69.1150383789755
x17 = -56.5486677646163
x17 = -56.5486677646163