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If f(x)={(-4sinx+cosx, "for",xle-(pi)/2)...

If `f(x)={(-4sinx+cosx, "for",xle-(pi)/2),(a sin x+b,"for",-(pi)/2ltxlt(pi)/2),(cosx+2,"for",xge(pi)/2):}` is continuous, then

A

`a=-1`

B

`a=1`

C

`b=-3`

D

`b=3`

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