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How many times do the graphs of y 3 sin x and y 3 sin3x intersect for x in the interval 10 20121 A 1920

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How many times do the graphs of y 3 sin x and y 3 sin3x intersect for x in the interval 10 20121 A 1920 B 1921 Without using tables evaluate A cos 36 cos 72 B cos 36 x cos 72 C 1922 D 1923 E 1924

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