In △ABC\triangle ABC△ABC, if a=4,b=5,a=4, b=5,a=4,b=5, and c=6c=6c=6, which equation is true?
62=42+52−2(4)(5)cos(C)6^2 = 4^2 + 5^2 - 2(4)(5)\cos(C)62=42+52−2(4)(5)cos(C)
42=52+62−2(5)(6)cos(C)4^2 = 5^2 + 6^2 - 2(5)(6)\cos(C)42=52+62−2(5)(6)cos(C)
52=42+62−2(4)(6)cos(B)5^2 = 4^2 + 6^2 - 2(4)(6)\cos(B)52=42+62−2(4)(6)cos(B)
All of the above