(a) Use the expression for sin 18 given in Exercise 54(f)
Chapter 6, Problem 55(choose chapter or problem)
(a) Use the expression for sin 18 given in Exercise 54(f) to show that the number sin 18 is a root of the quadratic equation (b) Use the expression for sin 15 given in Exercise 52(g) to show that the number sin 15 is a root of the equation
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