Problem

Problem

The sides of a triangle are in AP. If the angles AA and CC are the greatest and smallest angle respectively, then 4(1−cos⁡A)(1−cos⁡C)4(1 - \cos A)(1 - \cos C) is equal to a. cos⁡A−cos⁡C\cos A - \cos C b. cos⁡Acos⁡C\cos A \cos C c. cos⁡A+cos⁡C\cos A + \cos C d. cos⁡C−cos⁡A\cos C - \cos A

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