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answered 2021-06-24 14:02:10 +0200
Square brackets are used to define lists, but you can nest parentheses:
lists
sage: pi_m = ((1+d)*g_1 + r*(1-d*mu)-c*d^2)^(2)/(4*g_1) + ((1+d)*g_2 - c*d^2)^(2)/(4*g_2)