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Answer:
(b) 3π/16
Explanation:
Point A is 3/4 of one full cycle of the function. A full cycle requires the argument of the cosine function to be 2π, so we have ...
8x = (3/4)(2π)
x = 3π/(2·8) . . . . divide by 8
x = 3π/16 . . . . at point A