(2a) The average of f(x) = cos(3x) (2b) The average of f(x) = x² (2c) The average of f(x) = 2x sin(x) (2d) The average of f(x) = 3x from 7/2 to T from (–10) to (10) from 0 to ↑ %3| from (-3) to (3)
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