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Solve. 4 cos3 45°.3 cos 40 tsin 450​

Answer»

ong>Answer:

4 cos3 40° – 3 COS 40° = cos (3 X 40°) [∵ cos 3A = 4 cos3 A – 3 cos A] = cos 120° = cos (180° – 60°) = -cos 60° = - 12Read more on Sarthaks.com - https://www.sarthaks.com/981232/the-value-of-4-cos-3-40-3-cos-40-is-a-3-2-b-1-2-c-1-2-d-1-2



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