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2 cos 1/2 (A+B) cos 1/2 (A-B) =
2 cos 1/2 (345+105) cos 1/2 (345-105) =
2 cos 1/2 (450) cos 1/2 (240) =
2 cos 225 cos 120
2×(-√2/2) × (-1/2)
-√2 × -1/2
√2/2
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