请问大佬，sympy计算得到FiniteSet实例后怎么取出特解啊

代码如下：
A, B, C, R, e, p = sympy.symbols(("A", "B", "C", "R", "e", "p"))
system = A * R * sympy.cos(e) * sympy.cos(p) + B * R * sympy.cos(e) * sympy.sin(p) + C * R * sympy.sin(e)
system.subs([(A, 0), (B, 0), (C, 1), (R,0.2),(e,0)])
solution=sympy.nonlinsolve([system],[p])
sympy.pprint(solution)
请问这个solution怎么求出特解啊，就比如2k*pi+pi/4，我应该怎么取出pi/4的特解啊！！！