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Mathematics, 16.03.2020 06:47 briizy

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15. If cosA + cosB + cosC = 0, then prove that:
cos 3A + cos 3B + cos 3C = 12 cosA COSB
D COSC

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SU UP
TL 4 sina
15. If cosA + cosB + cosC = 0, then prove that:
cos 3A + cos 3B +...

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