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Q.

If ⨍ x:Cosx,x03x+α,0<x<2βx+3,2x411,x>4 is continuous on R then α2+β2=

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a

7

b

9

c

3

d

5

answer is C.

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Detailed Solution

fx=cosx: x03x+α :0<x<2βx+3 :2x411 :x>4  is continuous at x = 0

limx0-  fx=limx0+fxlimx0-cosx=limx0+3x+α

α=1

At x=4, limx4- fx=limx4+fxlimx4-βx+3=limx4+11

4β+3=114β=8β=2

α2+β2=1+4=5

Option (3) is correct

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If ⨍ x:Cosx,x≤03x+α,0<x<2βx+3,2≤x≤411,x>4 is continuous on R then α2+β2=