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Q.

The value of 'θ ' of the Lagrange's mean value theorem for  x=x2-2x+3, a=1, h=1/2 
 

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a

1/4 
 

b

1/8 
 

c

3/4 
 

d

1/2

answer is D.

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Detailed Solution

f1(x)=2x-2 f1(a+θh)=f(a+h)-f(a)h f11+θ2=(a+h)2-2(a+h)+3-a2+2a-3h                  =h2+2ah-2hh=h+2a-2 21+θ2-2=12+2-2           θ=12

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