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For a = which of the following holds good (A) tana. tan 2a. tan 4a = tan 4a + (B) 8 cos a. cos

For a = which of the following holds good (A) tana. tan 2a. tan 4a = tan 4a + (B) 8 cos a. cos 2a.cos4a = 1 (C) 8 sin a. sin 20. sin 4a - 5 (D) cos a - cos 2a + cos 3a = 1

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