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If f(x) {{:( 1,"for " (-pi)/( 2)lt x lt...

If f(x) ` {{:( 1,"for " (-pi)/( 2)lt x lt 0 ),( 1+sin x,"for" 0le xlt (pi)/(2) ):},then ` at x= 0 ,f'(x) -

A

1

B

-1

C

`infty `

D

does not exist

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The correct Answer is:
B
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