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If f(x) = sgn(sin^2x-sinx-1) has exactly...

If `f(x) = sgn(sin^2x-sinx-1)` has exactly four points of discontinuity for `x in (0, npi), n in N`, then

A

minimum value of n is 5

B

maximum value of n is 6

C

there are exaclty two posoible values of n

D

none of these

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The correct Answer is:
C
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