List of Standard Identities(a + b)2 = a2 + b2 + 2ab.(a – b)2 = a2 + b2 – 2ab.(a + b)3 = a3 + b3 + 3ab(a + b) = a3 + b3 + 3a2b + 3ab. ... (a – b)3 = a3 – b3 – 3ab(a – b) = a3 – b3 – 3a2b + 3ab. ... (a + b + c)2 = a2 + b2 + c2 + 2ab + 2bc + 2ca.a3 – b3 = (a – b)(a2 + ab + b2)a3 + b3 = (a + b)(a2 – ab + b2)