6. 7. Which of the following functions has the longest period? y = 6 sin(3x) + 20 b. y = 8 cos(2x) - 4 a. tan x 4 1- tan + tan X a. tan tan 元 12 x is equivalent to which expression? b. tan X 12 C. C. y = 7cos(xx) + 13 tan 5% 12 d. d. y = 2 sin(0.5x) - 11 tan 24

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