The teacher will be very surprised to see your correct solution 😉
/x pi\ tan|- + --| = -1 \3 6 /
sum
-5*pi ----- 4
=
-5*pi ----- 4
product
-5*pi ----- 4
=
-5*pi ----- 4
-5*pi/4
x1 = -60.4756585816035
x2 = 52.621676947629
x3 = 90.3207887907066
x4 = -79.3252145031423
x5 = 43.1968989868597
x6 = -88.7499924639117
x7 = -98.174770424681
x8 = -41.6261026600648
x9 = 14.9225651045515
x10 = -3.92699081698724
x11 = -51.0508806208341
x12 = -69.9004365423729
x13 = -13.3517687777566
x14 = -32.2013246992954
x15 = 24.3473430653209
x16 = 80.8960108299372
x17 = -22.776546738526
x18 = 71.4712328691678
x19 = 62.0464549083984
x20 = 99.7455667514759
x21 = 5.49778714378214
x22 = 33.7721210260903
x22 = 33.7721210260903