|   | 1 |  initial version  | 
You could try
var('t')
solve(cos(2*t)==sin(t),t,to_poly_solve='force')
which gives [t == -1/2*pi - 2*pi*z24, t == 1/6*pi + 2/3*pi*z25]
Z's are integers.
 Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.
 
                
                Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.