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Q.

If f(x)=a|sin⁡x|+be|x|+c|x|3 and if f(x) is differentiable  at x=0, then

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a

a=b=c=0

b

a=0,b=0,c∈R

c

b=c=0,a∈R

d

c=0,a=0,b∈R

answer is B.

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Detailed Solution

If  x≥0  then  fx=a sin x + b ex + c x3                           f'(x)=a cos x + b ex + c 3x2  f'0+= a + b + 0 = a + b If  x<0  then fx = -a sinx + b e-x-c x3                          f'x =-a cos x - b e-x -3cx2                         f' 0-= -a -b    since f is differentiable at x = 0 ,           f'0+ =f'0- ⇒ a+b = -a-b ⇒ a + b = 0    and  c ∈ R        so option is  (2)
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