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[" (A) "sim cos3x*cos^(3)x+sin3x*sin^(3)...

[" (A) "sim cos3x*cos^(3)x+sin3x*sin^(3)x=0],[" (B) "sim sin3 alpha=4sin alpha sin(x+alpha)sin(x-alpha)],[" where "alpha" is a constant "!=n pi" ."],[" (C) "quad |2tan x-1|+|2cot x-1|=2],[" (D) "quad sin^(10)x+cos^(10)x=(29)/(16)cos^(4)2x]

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