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Q.

Let f:R→R be defined as fx=2sin−πx2,ifx<−1ax2+x+b,if−1≤x≤1sinπx,ifx>1 If f(x) is continuous on R , then a+b equals:

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a

-3

b

3

c

1

d

-1

answer is D.

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Detailed Solution

f(x)=2sin-πx2,x<-1=ax2+x+b,-1≤x≤1=sinπx,x>1  is continuous ∀x∈R⇒f-1-=f-1+=f(-1),f1-=1+=f(1)⇒2=|a+b-1|,|a+b+1|=0 a+b+1=0⇒a+b=-1
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