cosx×cos2x×cos4x=1/4
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Answer:
Step-by-step explanation:
(cos3x - cosx)/2*cos4x = 1/4
cos3x*cos4x - cosx*cos4x = 1/2
cos7x - cosx - cos5x + cos3x = 1
solve this or
cosx*cos2x*cos4x = 1/4
sin8x/sinx = 2
sin8x - 2sinx = 0
solve this
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