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2.) (a) Use a trigonometric identity to show that cos 30 = cos3 0 - 3 cos 0 sin2 0. (b) Use the identity in

2.) (a) Use a trigonometric identity to show that cos 30 = cos3 0 - 3 cos 0 sin2 0. (b) Use the identity in part (a) to find a Cartesian equation for the curve r = cos 30. Leave the equation in implicit form

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