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Which of following in an equation of SHM...

Which of following in an equation of SHM with time period `pi/omega`?

A

`sine^2(omega t)`

B

` cos(omega t) + cos(2 omega t) + cos(3 omega t)`

C

`3 cos((pi/4 )- 2 omega t)`

D

none

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JEE MAINS PREVIOUS YEAR-JEE MAIN 2021-PHYSICS SECTION B
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