What effect does the negative sign have on the graph of y = -2 cos x?   reflects the graph of y = cos x over the x-axis   reflects the graph of y = cos x over the y-axis   shifts the graph 2 units down   shifts the graph 2 units

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A: N = 20n(D) = 17n(C) = 7n(Dc∩Cc) = 1 ⇒N - n(D∪C) = 1 ⇒n(D∪C) = 19n(D∪C) = n(D) + n(C) - n(D∩C)So,…

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