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Help please anyone ? QUESTION 13 7.14 Find the values of the x-coordinates of the points where the graph of the function have horizontal tangents.

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QUESTION 13 7.14 Find the values of the x-coordinates of the points where the graph of the function have horizontal tangents. (Hints: You find the vaues of x -coordinates only. You do not need to find the values of the y-coordinates.). y = cos x + sin 2x, 0

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