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The value of k in order that f(x)=sin x-...

The value of k in order that `f(x)=sin x-cos x-kx +b` decrease for all real values is given by :

A

`k lt sqrt(2)`

B

`k ge sqrt(2)`

C

`k lt 1`

D

`k ge 1`

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The correct Answer is:
B
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