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Mathematics, 31.01.2020 01:53 look26goingjbgy

Which function has a period equal to half the period of the function in y = -3sin(2/3x - 2π) + 2?
a. y = 3cos(2/3x - π) + 2
b. y = -3/2cos(2/3x - 2π) + 2
c. y = -3cos(2/3x - 2π) + 2
d. y = 3cos(4/3x - 2π) + 2

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Which function has a period equal to half the period of the function in y = -3sin(2/3x - 2π) + 2?
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