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If theta in [0 , 5pi] and r in R such th...

If `theta in [0 , 5pi]` and `r in R` such that `2 sin theta = r^4 - 2r^2 + 3`, then the number of pairs`(r , theta)` is

A

8

B

10

C

6

D

none of these

Text Solution

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The correct Answer is:
C
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