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[" 16) 2"],[" If "2cos x+2cos3x=cos y" a...

[" 16) 2"],[" If "2cos x+2cos3x=cos y" and "],[2sin x+2sin3x=sin y" then "cos2x=],[qquad [" (1) "3" ) "1/8," 4) "718]]

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