The number of distinct solutions of equation (5 4)cos 2 2x cos 4 x sin 4 x cos 6 x sin 6 x 2 in the interval 0, 2 is (a) 2 (b) 8 (c) 4 (d) 1

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The number of distinct solutions of equation (5/4)cos 2 2x + cos 4 x + sin 4 x + cos 6 x + sin 6

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

(d) 1

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