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Sage can compute it, but you must help it with reduce_trig(): sage: a = 8sin(pi/9)^3 - 6sin(pi/9) + 3^(1/2) sage: a.reduce_trig() 0

Sage can compute it, but you must help it with reduce_trig(): reduce_trig():

sage: a = 8sin(pi/9)^3 - 6sin(pi/9) + 3^(1/2) sage: a.reduce_trig() 0

Sage can compute it, but you must help it with reduce_trig():

sage: a = 8sin(pi/9)^3 - 6sin(pi/9) + 3^(1/2) 3^(1/2)

sage: a.reduce_trig() a.reduce_trig()

0

Sage can compute it, but you must help it with reduce_trig():

a = 8sin(pi/9)^3 8*sin(pi/9)^3 - 6sin(pi/9) 6*sin(pi/9) + 3^(1/2)
3^(1/2)
a.reduce_trig()
0