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cos5x=acos5x+bcos3x+ccosx\cos 5x=a \cos^5 x+b \cos^3 x+c \cos xcos5x=acos5x+bcos3x+ccosx
If a,b,a, b,a,b, and ccc are constants that satisfy the trigonometric identity above, find the value of c.c.c.
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