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I’m stuck between B and D but not sure which one is correct

Which function's graph has a period of 2?

I’m stuck between B and D but not sure which one is correct Which function's graph-example-1

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Answer:

the answer is (d) . )))))((((

User Damon Horrell
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Answer: B. y= -4sin piX (Tha PEX)

User Jim Clermonts
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