The number of distinct solutions of equation (5/4)cos 2 2x + cos 4 x + sin 4
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Question:
The number of distinct solutions of equation (5/4)cos22x + cos4x + sin4x + cos6x + sin6x = 2 in the interval [0, 2?] is
(a) 2
(b) 8
(c) 4
(d) 1
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