The value of k, for which (cos x+ sin ...

The value of `k`, for which
`(cos x+ sin x)^(2) +k sin x cos x-1 =0` is an identity, is ............ `(A) 2 (B) -2 (C) 0 (D) 1`

A

`-1`

B

`-2`

C

0

D

1

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The correct Answer is:

B

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