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If f(x) is derivable at x =2, where f(x...

If f(x) is derivable at x =2, where ` f(x) ={{:( x^(2),"for" xle 2 ),( ax + b,"for " xgt2 ):},then `

A

a= 4 ,b=-4

B

a=-4 ,b=4

C

a=4,b=4

D

a=-4,b=-4

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The correct Answer is:
C
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